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TravelUp has a rating of 4.5 stars from 9,070 reviews, indicating that most customers are generally satisfied with their purchases. Reviewers satisfied with TravelUp most frequently mention great price, easy process, and cancellation policy. TravelUp ranks 4th among Discount Travel sites.

This company responds to reviews on average within 7 days

What reviewers want you to know

Positive highlights.

Booking process was easy to use and worked perfectly
Just wanted to share a quick update on my booking experience so far—it's been smooth sailing!

Critical highlights

Appalling customer service and would never use them again!
It keeps rejecting my credit card issued by Citibank

“Great”

Great. Always find the best price at Travel Up with clear descriptions of how many and what kind of beds are in each room!

“Sad to say I would never use them again”

Sad to say I would never use them again. I had to change the date within 72 hours because of a work meeting. When I tried to rebook our hotel, the price was now $900+ more for the same 7 days. I checked directly with the hotel and their rate was $560 less than Travel Up. I told Jacob to match it or cancel it. After a few more blah blah emails from Jacob, I finally got canceled. A rip off and not at all a nice experience.

Reviews (9,070)

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From the business

We have always used leading technologies to present a website that is friendly and easy to use for everyone and anyone – some may even say there’s 0% faff! You won’t be short of choices when you book, we offer flights, hotels and package holidays to anywhere in the world. We work with over 200 airlines and offer over 400,000 hotels to bring you the best deals to destinations you love and with our flexible payment options, you could jet off sooner than you think. Want to get off the beaten track? We can offer bespoke tours and holidays so you can be sure you tick absolutely everything off your bucket list! Our experienced agents will be able to help you with any questions or queries you may have too and can book everything from car hire to transfers to attraction tickets, making your holiday stress and hassle free. But don’t just take our word for it, we’ve grown at such a rapid rate that in 2018, we were listed on The Sunday Times Virgin Atlantic Fast Track 100 where we came 37th. We’ve also been nominated for Best Online Retailer and Best Flight Booking Website by the British Travel Awards in 2019, as well as our CEO picking up the EY Entrepreneur of the Year’s Scale Up award for London and the South region. We’ve upped our travel game, up yours! At TravelUp, it’s our commitment to be as transparent as possible with our customers. We work with an independent partner, Airlineratings.com to keep track of the service and safety levels of all the airlines we work with. Not only does this keep us up to date with the latest information, it can also help you make an informed choice when choosing who to fly with. We take issues seriously and do our best to resolve them as soon as possible and in a way that will benefit all involved.

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Discount Travel , Travel Agency , Plane Tickets
#4 in Discount Travel
Aldermaston, Berkshire, United Kingdom
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Business History

We are TravelUp, we started from humble beginnings in 2004 where we operated out of our CEO’s living room. Now, we welcome more than 650,000 customers per year and strive to fuel our passion of travel to inspire you to go on your dream holiday.

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TravelUp Reviews

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Reviews 4.3.

95,146 total

Most relevant

Brilliant service, truly helpful agents

Honestly cannot recommend Travelup enough. Nothing but reliable service. I was stuck with a medical emergency on my last trip and Travelup were absolutely phenomenal in supporting and assisting me in making the necessary travel arrangements and changes. It was a complex situation and my agent, Elena W, went above and beyond to help me, she was an absolute angel! When using price comparison sites now I actively seek out Travelup deals and will often go straight to their website in the first instance. Absolutely brilliant team, especially Elena who was just amazing!

Date of experience : January 04, 2024

Reply from TravelUp

Good afternoon, Thank you so much for sharing your 5* feedback about our service. We are glad to hear that Elena Williams's performance exceeded your expectations regarding your trip. We will make sure that our representative receives the recognition she deserves. Thank you for your compliment. Have a great afternoon ahead. Regards, TravelUp

Fairly easy to follow the website…

Fairly easy to follow the website instructions. Only issue so far is that the email with the confirmation details doesn't print or save the whole page width.

Date of experience : May 12, 2024

Booked my flights to Hong Kong and got instant confirmation. 25kg luggage on iternary but airline said I'm entitled to 30kg. Travel up hassle free would choose them again.

Date of experience : May 08, 2024

Good morning, Miss. Lau, We are grateful and do appreciate you taking the time to share your 5* reviews with us. We are glad you enjoyed our product & services seamlessly. Thank you for your compliment. Have a great day ahead. Regards, TravelUp

Cheapest website price on flights ! Straightforward & Simple!

Through the comparison website, TravelUp came up with the cheapest option. the entire booking process was pretty straightforward and without complications. I'm certain I'll be using this site for future reservations.

Date of experience : May 10, 2024

Good morning, Mr. Balchandani, We are grateful and do appreciate you taking the time to share your 5* reviews with us. We are glad you enjoyed our product & services seamlessly. Thank you for your compliment. Have a great morning ahead. Regards, TravelUp

Very easy process

Very easy process. All the flight information and extra costs were clear and simple. Was cheaper adding the extras via Travel Up than the airline!

As usual with TravelUp the process was…

As usual with TravelUp the process was very clear, easy and very efficient. They provide an excellent service. Highly recommended.

Date of experience : May 09, 2024

Good evening, Thank you for sharing your 5* review with our community. Your feedback is important to us, and we will continue to strive for the same level of services in the future. Hope to hear from you again about your upcoming trip. Regards, TravelUp

Just booked a flight for 2 from…

Just booked a flight for 2 from Heathrow to Singapore. Great price, easy to navigate. All done super quick

Date of experience : May 11, 2024

Good morning, Mrs. Rumsey, Thank you for the 5*review. We are glad you liked our online booking prices and found the services smooth and easy to use. Thank you for booking with us. Regards, TravelUp

First time here

First time here, very good deal, not found anything similar on any other sites.

Good morning, Kumar, Thank you for the 5*review. We are glad you liked our online prices and found the services smooth and more competitive than other sites. Thank you for booking with us. Regards, TravelUp

Everything was made so easy

Everything was made so easy, at first I was a bit wary because I had never booked with travel up before but I will definitely be doing again!

Date of experience : April 27, 2024

Good morning, We are grateful and do appreciate you taking the time to share your 5* reviews with us. We are glad you enjoyed our product & services seamlessly. Thank you for your compliment. Have a great day ahead. Regards, TravelUp

I just booked my tickets and it is…

I just booked my tickets and it is comparatively good price. The rest of the feedback will be given after my travel completion.

Date of experience : May 06, 2024

Good morning, Mr. Shrestha, We are grateful and do appreciate you taking the time to share your 5* reviews with us. We are glad you enjoyed our product & services seamlessly. Thank you for your compliment. Have a great day ahead. Regards, TravelUp

The worst place to purchase a ticket…

The worst place to purchase a ticket all the reviews are fake they scammed me! They just booked a void ticket and never refunded my money I got to know this when I was doing my web check in! They are scammers they are liars! And you Travel up fu**ing team don't act smart I'm behind you! I want my money back or else my lawyer sister is coming behind you!

TravelUp are aweseome

Fast, reliable service at great prices. Using TravelUp for the second time.

Good evening, Mr. Rafique, Thank you for the 5*review. We are glad you liked our online booking process and found the services swift and reliable. Thank you for booking with us. Regards, TravelUp

Had to cancel my flights due to my…

Had to cancel my flights due to my daughter being diagnosed with a brain tumour. Ill health was not a reason to enable me to change my booking, offer me a credit to be used later as a more reputable agent would do. Then after cancelling and losing my money, sent me a notification that the flights had changes and a followup email to say - ignore your booking was cancelled- would not use again

Date of experience : February 14, 2024

This is the 2nd time I used TravelUp and it's great

This is the 2nd time I used TravelUp and the experience has been great. It's legit and not scammy like some other travel booking websites.

Date of experience : May 02, 2024

Good evening, Ginny, Thank you for sharing your 5* review with our community. Your feedback is important to us, and we will continue to strive for the same level of services in the future. Hope to hear from you again about your upcoming trip. Regards, TravelUp

Great service whilst taking money

Great service whilst taking money, but having to cancel due to a medical condition, found their customer services very rude and unprofessional. Nearly 2 months of trying to get an acceptable cancellation invoice rather than a copy and paste sales invoice with the title changed. Lazy service and no nothing even after multiple promises from Jenna Summers that she would sort this. Operators hide behind the fact you can’t get through to a manger to discuss the matter. Avoid unless you think saving a few quid is acceptable for the poor customer service.

quick and easy

so quick so easy and you know they are genuine reviews so well done

Good afternoon, Deborah, Thank you for the 5*review. We are glad you liked our online booking process and found the services quick and easy to use. Thank you for booking with us. Regards, TravelUp

Travel up is a great company

Travel up is a great company - easy to use and so reliable

Good morning, Yvonne, Thank you for sharing your 5* review with our community. Your feedback is important to us, and we will continue to strive for the same level of services in the future. Hope to hear from you again about your upcoming trip. Regards, TravelUp

Ease of use

Ease of use, will recommend Travelup to all colleagues.

Good morning, William, Thank you for your 5-star rating. Your feedback is appreciated. Thank you for booking with us. Regards, TravelUp

First class service

First class service, great prices, easy booking process.

Good afternoon, Mr. Geddes, We are grateful that you chose to give us a 5* rating with your valuable time. Our team enjoys doing what they do because of customers like you. Your review has made our day. Thank you for your compliment. Regards, TravelUp

NO last stage "unavailability"messages

NO last stage "unavailability"messages. I have used them for my last 5 travels.

Date of experience : May 07, 2024

Good morning, Mr. Gupta, Thank you for sharing your 5* review with our community. Your feedback is important to us, and we will continue to strive for the same level of services in the future. Hope to hear from you again about your upcoming trip. Regards, TravelUp

UponArriving

Known Traveler Number Guide: (How to Lookup, Global Entry, Pre-Check) [2023]

This comprehensive article will tell you everything you need to know about your Known Traveler Number.

I’ll cover how you can get one and the best way to do that with programs like TSA Pre-Check and Global Entry. I’ll show you how to look-up your Known Traveler Number and add it to your travel itineraries with airlines like United, Southwest, and Delta.

Finally, I’ll explain the differences between a Known Traveler Number and a Redress Number.

Table of Contents

What is a Known Traveler Number?

A Known Traveler Number, also called your “KTN,” is a 9-digit number used to link your TSA Pre-Check enrollment to your travel itinerary in order to ensure that you can receive TSA Pre-Check benefits like expedited security screening.

This is the same number used for other trusted traveler programs, such as Global Entry, NEXUS, and SENTRI . However, for these latter programs, this number is known as your “PASSID.”

Tip: Use the free app WalletFlo to help you travel the world for free by finding the best travel credit cards and promotions!

Why do you want a Known Traveler Number?

With a Known Traveler Number, you can participate in TSA Pre-Check, which means you’ll be able to breeze through security at airports.

How do you get a Known Traveler Number?

You can get a Known Traveler Number by signing up, getting approved, and paying the fees for any of the following programs:

TSA Pre-Check

Global entry.

As already discussed, TSA Pre-Check will usually get you through airport security in a breeze.

You’ll usually get access to a priority security line which is often much shorter than the standard security line (though not always, unfortunately).

You’ll also be able to go through a less restrictive and invasive screening process. You often only have to pass through a traditional metal detector (as opposed to the full-body scanners) and you also get to enjoy the following benefits:

Shoes can stay on
Belt can stay on
Light jackets can stay on
Laptops allowed to stay in bag
Liquids ( 3-1-1 Rule ) can stay in bag

This program costs $78 to enroll for five years and it does not require the extensive interview process that Global Entry requires. There are multiple ways to get TSA Pre-Check for free and you can read about those here.

Global Entry would be my preferred method for obtaining a Known Traveler Number. That’s because not only will you get TSA Pre-Check, but you’ll also get expedited entry at Customs and Immigration when making your way back into the US.

This program does require you to attend an interview to be approved but the interview process is not difficult at all . If you’ve got a clean criminal history and come prepared with your documents then you should pass the background check and interview without any issues at all.

In some cases this “interview” process will only take about five minutes total.

You might get asked some very basic questions like what countries you have visited and whether or not you have traveled for business or pleasure. It’s hardly anything close to an interrogation in most cases.

The hardest part is often scheduling the interview because availability can be limited and in some cases it might take weeks (or even months) to find an open slot.

Luckily, some airports offer interviews upon arriving from international locations. So if you have some international travel coming up, this can be one of the easiest ways to get approved for Global Entry.

There are many credit cards that come with a $100 statement credit for your Global Entry application fee, so it’s very easy to get this program for free. My personal recommendations for getting a $100 statement credit for your Global Entry/TSA Pre-Check is to go with the United Explorer Card. It has great perks and a low annual fee and you can read more about it here!

Since you’ll get both TSA Pre-Check and expedited entry back into the US, I think Global Entry is the way to go for many people.

NEXUS is a joint program between the US and Canada that will grant pre-approved, low-risk travelers expedited entry into both Canada and the US. Specifically, membership in the NEXUS program allows you to reduce your wait times at designated ports of entry by:

Using dedicated processing lanes at land border crossings
Using NEXUS kiosks when entering Canada
Using their card in dedicated SENTRI lanes along the U.S.-Mexico border
Using Global Entry kioks when entering the United States, and
Calling a marine telephone reporting center to report your arrival into the United States and Canada

You may also be granted access to the Canadian Air Transport Security Authority (CATSA) Security Line at some Canadian airports to expedite airport pre-boarding security screening. (This is like a Canadian version of TSA Pre-Check.)

Just like Global Entry, NEXUS will require you to clear a background check. The difference is that this background check also is submitted to Canadian authorities, such as the Canadian Security Intelligence Service (CSIS), Royal Canadian Mounted Police (RCMP).

One of the major draws to the NEXUS program is that the application fee is only $50 . This is surprising since NEXUS comes with both Global Entry and TSA Pre-Check, which cost $100 and $85 respectively. For people who live near or travel between the US/Canada border, NEXUS is an especially attractive bargain.

The Secure Electronic Network for Travelers Rapid Inspection (SENTRI) is a U.S. Customs and Border Protection (CBP) program that allows expedited clearance for pre-approved, low-risk travelers upon arrival in the United States.

You can enter the United States by using dedicated primary lanes into the United States at Southern land border ports so this is a program you might be interested in if you’re traveling between the US and Mexico a lot.

You might be a little overwhelmed with all of the different Trusted Traveler programs and perhaps you’re not sure which program you should sign-up for.

If that’s the case you can check out this TSA tool which can help you narrow down what program is most ideal for you based on your citizenship, number of flights, and travel destinations.

Other related travel programs

CLEAR is a privately owned service offered to passengers that allows them to bypass the lines going into airport security, whether you are going into the standard security line or the TSA Pre-Check line.

In order to use it you find the CLEAR line leading to security which should have little to no line and then you simply scan your boarding pass and biometric data and then you’re off to the races and able to skip whatever line you would have been waiting on. You don’t even have to show your ID.

CLEAR can be great for frequent flyers in busy airports but it’s not cheap at $179 per year (though cheaper promos are often available). This program does not require you to have a Known Traveler Number.

Mobile Passport

Launched in the fall of 2014, Mobile Passport Control is an app, developed by Airside Mobile and Airports Council International-North America in partnerships with CBP, that you can download to use in order to expedite your entry into the US. It’s available in the Apple App Store and Google Play .

It’s free to use and can be just about as good as Global Entry at some airports, though I’d still take Global Entry over Mobile Passport.

That’s because Global Entry gets you Pre-Check and also allows you to get through customs AND immigration while Mobile Passport often only get your priority access through immigration. This program also does not require you to have a Known Traveler Number.

Adding a Known Traveler Number

Once you have your Known Traveler Number, you’re going to need to add that number to your travel profiles for the various airlines so that your Known Traveler Number will automatically show up in your itineraries.

However, you should note that your Known Traveler Number will NOT automatically show up in all of your travel itineraries.

Many people assume that once they add their Known Traveler Number to their profile, it will always show up but that’s not the case. So you always need to double check that your KTN was added.

Below, you can see how to add your Known Traveler Number to some of the major airlines. For whatever reason, it is not always the easiest thing to do since you often have to click around a lot.

Usually you can find where to input it if you just look for your profile and a button allowing you to edit your profile, but the steps below should help you locate this.

American Airlines

Sign in to your American Airlines account and then click on your name at the top of the page. Then click on “your account.” Next, click on “edit account” and then click on “Information and password.” Scroll down and then under “Secure traveler,” you will see where to input your Known Traveler Number.

Sign in and click on “My Account” and then scroll to “My Preferences” to change your personal details within your profile information.

Sign in and click on Profile and Preferences and then click on “Travel identification documents” and then you’ll see the area to enter it in below.

Go to the Delta website and log-in and then proceed to My Delta -> My Profile -> Basic Info. You’ll then see a field where you can input your Known Traveler Number.

First, sign in to your JetBlue account. Click on the arrow in the upper right corner by your name and then click on “Edit profile.” Scroll down and you will see where to input your information.

Hawaiian Airlines

First, sign in to your Hawaiian Airlines account. Go to My Account and under that click on “Profile & Settings.” Click on the travel tab and you will see where to input your information.

Travel portals and OTAs

Most online travel agencies (like Expedia) will allow you to enter in your Known Traveler Number into your profile which should populate into your itinerary when you make a booking.

But since you’re dealing with a third party, you should always verify that your number was properly included in your booking.

Add Known Traveler Number after booking?

If you add your Known Traveler Number to your profile after you make a flight reservation, there’s a good chance that your flight itinerary is not linked to your Known Traveler Number and you won’t get TSA Pre-Check.

In that case, you should be able to call up the airline and request for them to input your number into your itinerary.

You could also just wait until you arrive at the check-in desk for baggage and request for your Known Traveler Number to be added to your boarding pass.

Also, sometimes you’ll have to re-add your Known Traveler Number to specific itineraries. It’s not always clear why this happens but sometimes you’ll just have to do it.

If you ever are given a boarding pass without TSA Pre-Check on it and you know you have a TSA Pre-Check membership, simply approach an agent at the check-in desk and tell them you would like to add your Known Traveler Number.

It’s usually no problem for them to do this and they can re-issue you a boarding pass in a couple of seconds that has TSA Pre-Check.

For the reasons above, I highly recommend that you keep your Known Traveler Number somewhere easily retrievable like in your smart phone in a folder or app that you won’t forget about and can quickly pull up.

Where can I look up and find my Known Traveler Number?

If you are a member of the TSA Pre-Check Application Program you can, look up your KTN online .

If you are a member of another trusted traveler program, such as Global Entry, NEXUS, or SENTRI, log on to the Trusted Traveler Program website to obtain your PASSID, which once again is the same as your KTN.

You’ll find it right under “Program Memberships.”

You can also check the back of your trusted traveler cards for your PASSID. Note that TSA does not issue an ID card like Global Entry, NEXUS, and SENTRI do.

Related: Can You Get Through TSA and Fly with No ID?

Global entry card with pass ID known traveler number

What is a redress number?

You might also be wondering about a redress number since that field often shows up near where you input your Known Traveler Number.

A redress number is the record identifier for people who apply for redress through the DHS Travel Redress Inquiry Program (DHS TRIP) .

“DHS TRIP is for travelers who have been repeatedly identified for additional screening and who want to file an inquiry to have erroneous information corrected in DHS systems.”

For example, someone might share the same name as another person on a no-fly list and that might bring up a red flag every single time this unfortunate traveler attempts to board a plane.

The redress number will help those people avoid additional searches, pat downs, and questioning in the future.

So in case you were wondering a redress number really has nothing to do with your Known Traveler Number.

Known Traveler Number for Military members

If you are a member of the military, you can utilize TSA Pre-Check for free.

Members of the U.S. Armed Forces can get expedited screening including those serving in the U.S. Coast Guard, Reserves, and National Guard.

This can be done by using the official Department of Defense (DoD) identification number when making flight reservations. Your 10-digit DoD ID number is located on the back of your Combined Access Card ID and it is not the same as your SSN. Read more about how to utilize this benefit here.

TSA Pre-Check vs Global Entry

Now that you’re aware of all of the benefits you might be wondering whether or not you should choose TSA Pre-Check or Global Entry.

The answer to this question depends a lot on your personal preferences.

If you are only going to be traveling within the US then your need for Global Entry will be nearly zero.

In that case, getting TSA Pre-Check should be just fine. The only drawback to that is that if an unexpected trip comes up you’ll lose out on the benefit you could have had with Global Entry.

On the other hand, if you’re going to be traveling internationally then you might want to think about Global Entry since it will save you a lot of time getting back into the country.

The two drawbacks to Global Entry are that it requires you to attend an interview and that the background check can be tough to clear if you have anything on your record like a DWI, DUI, etc.

Known Traveler Number FAQ

The easiest way would be to get approved for TSA Pre-Check .

No, you do not need a Known Traveler Number for CLEAR?

At the time of booking, you will typically see a field where you can enter your Known Traveler Number. In addition, you can add your Known Traveler Number to your frequent flyer profile. If you are at the airport, you can also ask an agent to add your Known Traveler Number to your boarding pass.

There is no practical difference and these are essentially the same.

As you can see, getting a Known Traveler Number can be very easy and can even be done for free with the right credit card.

I recommend going with a program like Global Entry to get your PASSID/Known Traveler Number and using a credit card with a $100 credit for Global Entry.

If you always keep your Known Traveler Number with you at all times you’ll be able to add it to your boarding pass when needed and there shouldn’t be any major issues.

Daniel Gillaspia is the Founder of UponArriving.com and the credit card app, WalletFlo . He is a former attorney turned travel expert covering destinations along with TSA, airline, and hotel policies. Since 2014, his content has been featured in publications such as National Geographic, Smithsonian Magazine, and CNBC. Read my bio .

I only travel to the States. Which one should I apply. I read and I see so many type to apply. Quite confusing. Truly appreciate if you can advise . Thank you Regards Teresa

If you don’t travel outside the US, TSA Pre-Check is a solid option.

Can we get KTNs at West Palm Beach International Airport or a post office in Boynton Beach Florida?

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TravelUp Reviews

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Reviews 4.3.

95,146 total

Most relevant

Brilliant service, truly helpful agents

Date of experience : 04 January 2024

Reply from TravelUp

Fairly easy to follow the website…

Fairly easy to follow the website instructions. Only issue so far is that the email with the confirmation details doesn't print or save the whole page width.

Date of experience : 12 May 2024

Booked my flights to Hong Kong and got instant confirmation. 25kg luggage on iternary but airline said I'm entitled to 30kg. Travel up hassle free would choose them again.

Date of experience : 08 May 2024

Cheapest website price on flights ! Straightforward & Simple!

Date of experience : 10 May 2024

Very easy process

Very easy process. All the flight information and extra costs were clear and simple. Was cheaper adding the extras via Travel Up than the airline!

As usual with TravelUp the process was…

As usual with TravelUp the process was very clear, easy and very efficient. They provide an excellent service. Highly recommended.

Date of experience : 09 May 2024

Just booked a flight for 2 from…

Just booked a flight for 2 from Heathrow to Singapore. Great price, easy to navigate. All done super quick

Date of experience : 11 May 2024

Good morning, Mrs. Rumsey, Thank you for the 5*review. We are glad you liked our online booking prices and found the services smooth and easy to use. Thank you for booking with us. Regards, TravelUp

First time here

First time here, very good deal, not found anything similar on any other sites.

Everything was made so easy

Everything was made so easy, at first I was a bit wary because I had never booked with travel up before but I will definitely be doing again!

Date of experience : 27 April 2024

I just booked my tickets and it is…

I just booked my tickets and it is comparatively good price. The rest of the feedback will be given after my travel completion.

Date of experience : 06 May 2024

The worst place to purchase a ticket…

TravelUp are aweseome

Fast, reliable service at great prices. Using TravelUp for the second time.

Good evening, Mr. Rafique, Thank you for the 5*review. We are glad you liked our online booking process and found the services swift and reliable. Thank you for booking with us. Regards, TravelUp

Had to cancel my flights due to my…

Date of experience : 14 February 2024

This is the 2nd time I used TravelUp and it's great

This is the 2nd time I used TravelUp and the experience has been great. It's legit and not scammy like some other travel booking websites.

Date of experience : 02 May 2024

Great service whilst taking money

quick and easy

so quick so easy and you know they are genuine reviews so well done

Good afternoon, Deborah, Thank you for the 5*review. We are glad you liked our online booking process and found the services quick and easy to use. Thank you for booking with us. Regards, TravelUp

Travel up is a great company

Travel up is a great company - easy to use and so reliable

Ease of use

Ease of use, will recommend Travelup to all colleagues.

Good morning, William, Thank you for your 5-star rating. Your feedback is appreciated. Thank you for booking with us. Regards, TravelUp

First class service

First class service, great prices, easy booking process.

NO last stage "unavailability"messages

NO last stage "unavailability"messages. I have used them for my last 5 travels.

Date of experience : 07 May 2024

Known Traveler Number program: What is it, and should you get 1?

Editor's Note

When you travel, there are a few pieces of information you probably like to keep handy, including your frequent flyer number, your passport number and your trip confirmation number.

However, another number comes into play if you have TSA PreCheck or Global Entry : your Known Traveler Number. It's an important number that ensures access to the TSA PreCheck lanes .

Here's what to know about getting a KTN, how to find it and how to ensure it's attached to your flight reservations.

What is a Known Traveler Number?

A KTN is a nine-digit code each TSA PreCheck and Global Entry member receives from the U.S. Department of Homeland Security upon approval for one of those two programs. Members of a couple of other Trusted Traveler programs get a KTN as well.

The code may be a combination of both letters and numbers. It's your identification number that proves you're a member of one of these programs and shows that you are eligible to use the TSA PreCheck lanes at U.S. airports.

Travelers with a KTN have gone through an application and screening process , and they are known and recognized as travelers by the U.S. government.

Should you apply for a Known Traveler Number?

Getting a KTN is helpful for air travel because if you have one, it means you're a member of a program that gets you shorter wait times.

A KTN is your key to access the TSA PreCheck lanes. These lanes typically have shorter lines and allow members to undergo a less intrusive screening process than the standard lanes. About 99% of TSA PreCheck customers wait 10 minutes or less at security, according to the Transportation Security Administration.

There are several ways to get a KTN through different Trusted Traveler programs run by the DHS. Each program requires travelers to submit an application and go through an interview process. Those interviews generally occur in person at enrollment centers for first-time applicants, with many enrollment centers located at airports. The government is allowing virtual interviews for certain applicants, often those seeking to renew their membership.

Each program that provides travelers with a KTN has a fee, and memberships in all programs are valid for five years. Many credit cards also offer application fee credits for Global Entry or TSA PreCheck .

TSA PreCheck

If you've applied for TSA PreCheck, gone through the screening process and received confirmation of your approval into the program, you'll receive a KTN from the government.

TSA PreCheck offers a fast-tracked security experience for its members. When going through the TSA PreCheck lanes, you generally won't have to remove your shoes, take laptops or liquids out of your bag, or go through the full-body scanner.

The application fee is $78 for first-time applicants.

Related: Denied for Global Entry or PreCheck? Here's how to appeal

Global Entry

If you've received your TSA PreCheck membership by applying for Global Entry, you'll receive your KTN through your Global Entry membership.

Global Entry is a U.S. Customs and Border Protection program that allows travelers designated as low-risk by the U.S. government to use faster customs lines when returning to the U.S. from abroad. Members also get access to TSA PreCheck.

The fee for an application to this program is $100.

If you're planning to travel internationally and within the U.S. multiple times in the next five years, Global Entry is probably your best bet since it gets you expedited screening both at customs and at TSA checkpoints for only $22 more than a standard TSA PreCheck membership.

Related: 13 things you need to know about Global Entry

Nexus and SENTRI

The DHS has two other Trusted Traveler programs for travelers entering the U.S. from Canada and/or Mexico. Nexus and SENTRI also provide members with TSA PreCheck access and, thus, a KTN.

Nexus allows pre-screened travelers to use expedited processing when entering the U.S. from Canada by air or land. The fee for this program's application is $50.

SENTRI allows pre-screened travelers expedited entry into the U.S. from Canada and Mexico by air, land or sea. The application fee for this program is $122.25.

How do you add a Known Traveler Number to your travel bookings?

Once approved for TSA PreCheck, Global Entry, Nexus or SENTRI, you'll have to follow one additional step to ensure "TSA PreCheck" is printed on your boarding pass: You have to attach your number to your airline profile.

If you're just looking to attach your number to a single reservation, you can typically do this when filling out your personal information at checkout when booking a flight. However, we recommend always flying with a frequent flyer account to earn miles .

If you have a frequent flyer account, you can attach your KTN right to the personal information section of your airline profile. Once you do this, your KTN should be automatically added to each booking you make with that airline, as you include your frequent flyer number on the reservation. You typically can add your KTN to an existing reservation, too.

What to do if you forgot to add a KTN to your flight

If you already booked a flight and forgot to add your Known Traveler Number to your reservation, don't fret. You should be able to easily pull up your reservation and add your KTN.

Go to the airline's website or mobile app. Pull up your reservation using the confirmation number (or record locator) the airline gave you when you booked your trip. Then, go to the traveler information section. There should be a line that says "Known Traveler Number," "KTN" or "Secure Traveler Information." That's where you put your KTN.

If you've already checked in for your flight and downloaded your boarding pass, you may need to re-download the boarding pass to see "TSA PreCheck" appear.

Related: What to do if a boarding pass isn't marked TSA PreCheck

Where can you find your Known Traveler Number?

The time when you'll most likely need your KTN handy is when booking a flight or updating your airline profile. This goes for new members of TSA PreCheck, Global Entry, SENTRI or Nexus, as well as existing members who might be flying with an airline for the first time since joining one of those programs.

With all the numbers, passwords and accounts we have to keep track of in our lives, it's easy to lose your KTN ... and most of us probably don't know our number by heart. Fortunately, there are a few ways to locate it.

If you're a standard TSA PreCheck member looking to track down your number, you can use this page from the DHS to put in your personal information and look up your number.

If you received your KTN through the Global Entry program, you have a couple of options. If you have your physical Global Entry card, check the backside. Your nine-digit "PASSID" is your KTN; it may start with "15," "98" or "99."

Another way to locate your Known Traveler Number is to log in to your Global Entry or other Trusted Traveler Program account. There, you should be able to see which program you're enrolled in, as well as your membership number/PASSID, which, again, is your KTN. You should also be able to see when your membership expires.

An additional option for tracking down your number is to check your frequent flyer account for an airline you've recently flown with. If your membership in one of the Trusted Traveler programs is active and you've used TSA PreCheck before, odds are your KTN is on file with one or more airlines you regularly fly.

For this option, you'll need to go to your airline profile. If your KTN is in your profile, you should see it listed under your personal information.

Bottom line

A Known Traveler Number is a code that gets you into the TSA PreCheck lane. It's how the airline and government recognize a trusted traveler who is a member of TSA PreCheck, Global Entry or other similar programs.

Keep your number handy and add it to your airline profile. If you're not a member, consider enrolling in one of these programs that gives you a KTN and makes your trip through the airport less of a hassle.

TSA PreCheck® KTN Lookup

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Please enter your information below (letters, spaces, hyphens (-), and apostrophes (') are allowed in name fields). Then click "Submit" to retrieve your KTN.

This tool is for TSA PreCheck® Application Program members only. Global Entry, NEXUS or SENTRI members may retrieve their PASSID (which serves as the KTN) at the Trusted Traveler Program website or on their Trusted Traveler card. Employment-based TSA PreCheck® members can find more details here: DoD HME TWIC®

Note: information provided below must match information provided during enrollment.

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Changing Your Known Traveler: A Step-By-Step Guide

Last updated May 09, 2024
Difficulty Advanced

Category Travel

Changing your known traveler status can be a daunting task, but it doesn't have to be. In Changing Your Known Traveler: A Step-By-Step Guide, we will walk you through the process of updating and modifying your known traveler status, making travel a breeze. Whether you're looking to upgrade to Global Entry, change your TSA PreCheck information, or simply update your personal details, this comprehensive guide has got you covered. So, get ready to embark on a seamless travel experience by changing your known traveler status with ease.

What You'll Learn

Overview of known traveler program, steps to change known traveler number, contacting the transportation security administration (tsa), updating known traveler information with airlines or trusted traveler programs.

The Known Traveler Program, also known as the TSA PreCheck program, is a service offered by the Transportation Security Administration (TSA) that allows pre-approved travelers to enjoy expedited security screening at airports. This program aims to enhance the travel experience by providing a hassle-free and more efficient process for eligible passengers.

The Known Traveler Program is available to U.S. citizens, U.S. nationals, and lawful permanent residents, as well as certain Canadian citizens and residents. To enroll in the program, travelers must apply through the TSA PreCheck application website or an authorized enrollment center. The application process requires applicants to provide personal information, such as their name, address, and date of birth, and to undergo a background check.

Once approved, travelers will receive a Known Traveler Number (KTN), which they can use when booking flights or add to their frequent flyer profiles. Having a KTN allows travelers to be eligible for expedited screening at more than 200 participating airports across the United States. The expedited security screening process generally involves not having to remove shoes, belts, or lightweight jackets, and a shorter wait time in a dedicated PreCheck lane.

If you need to change your Known Traveler information, such as your name or your KTN, you will need to follow a few steps:

Visit the TSA PreCheck application website or contact the TSA directly to inform them about the change you need to make. You can find the contact information for the TSA on their official website.
Provide the necessary documentation to support the change. This may include legal documents, such as a marriage certificate or court order, to change your name or a new government-issued identification to update your personal information.
Depending on the nature of the change, you may need to go through the application process again. This may involve filling out a new application, paying the associated fee, and undergoing a background check.
Once the change has been processed, you will receive an updated Known Traveler Number reflecting the changes you made. Make sure to update your airline or travel agent with your new information to ensure your reservations are associated with your updated KTN.

It's important to note that changing your Known Traveler information may take some time, so it's advisable to make any necessary updates well in advance of your planned travel dates. Additionally, certain changes may require additional documentation or steps beyond what is mentioned here, so it's best to consult with the TSA for specific instructions based on your circumstances.

In conclusion, the Known Traveler Program offers a convenient and efficient way for eligible travelers to navigate airport security. If you need to change your Known Traveler information, ensure you follow the necessary steps outlined by the TSA to update your details and obtain an updated Known Traveler Number. By doing so, you can continue to enjoy the benefits of expedited screening and a streamlined airport experience.

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If you are a frequent traveler, you may already be familiar with the concept of a Known Traveler Number (KTN). This is a unique identification number assigned to individuals who have undergone a thorough background check and are considered low-risk travelers. The KTN allows you to enjoy a more efficient and expedited security screening process at airports within the United States.

However, there may be instances where you need to change your Known Traveler Number. This could be due to a change in your eligibility status, a desire to switch to a different trusted traveler program, or the need to update your personal information. Whatever the reason, changing your Known Traveler Number is a relatively straightforward process. Here are the steps you need to follow:

Log in to the Trusted Traveler Program website: To change your Known Traveler Number, you will need to access the website of the trusted traveler program you are currently enrolled in. This could be programs such as TSA PreCheck, Global Entry, NEXUS, or SENTRI. Open the program's website and log in to your account using your credentials.
Navigate to the profile or personal information section: Once you are logged in, look for the profile or personal information section on the website. This is where you can update your contact details, identification information, and Known Traveler Number.
Find the Known Traveler Number field: Within the profile or personal information section, you should be able to locate the field where your Known Traveler Number is currently displayed. It may be labeled as "Known Traveler Number," "KTN," or something similar. Take note of your current number before proceeding.
Edit or update the Known Traveler Number: Next, look for the option to edit or update your Known Traveler Number. It may be an icon or button that allows you to input a new number. Click on the appropriate option and a text box should appear where you can enter your new number.
Enter your new Known Traveler Number: Type in your new Known Traveler Number in the provided text box. Be sure to double-check the accuracy of the number before saving the changes.
Save or update your changes: Once you have entered your new Known Traveler Number, look for the save or update button on the website. Click on it to confirm and store your changes. The website may prompt you to confirm the change to ensure the accuracy of the information.
Verify the change: After saving your changes, it is essential to verify that your new Known Traveler Number has been successfully updated. Review your profile or personal information section again to ensure that the correct number is now displayed.
Contact customer support if needed: If you encounter any issues or have difficulties changing your Known Traveler Number through the website, it is recommended to contact customer support for further assistance. They will be able to guide you through the process or address any concerns you may have.

By following these simple steps, you can easily change your Known Traveler Number and ensure that your expedited airport security screening privileges are up to date. Whether you are switching to a different trusted traveler program or updating your personal information, staying on top of your Known Traveler Number is essential for a seamless travel experience.

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If you need to change your Known Traveler Number (KTN) with the Transportation Security Administration (TSA), you can easily do so by contacting their support team. The Known Traveler Number is a unique identifier that allows travelers to use expedited security screening lanes at the airport. Changing your KTN may be necessary if your personal information has changed or if you have enrolled in a different Trusted Traveler Program.

To contact the TSA regarding your KTN, follow these steps:

Check the TSA's official website: Before contacting the TSA, it's always a good idea to check their official website for any specific instructions or updates related to changing your Known Traveler Number. The TSA website is a reliable source of information and can provide you with the most up-to-date guidance.
Gather the required information: Before contacting the TSA, make sure you have all the necessary information readily available. This includes your current KTN, your full name as it appears on your identification documents, your date of birth, and any other relevant personal details.
Call the TSA helpline: The TSA helpline is available to assist travelers with questions and concerns, including changing their KTN. To reach the helpline, dial 1-866-289-9673 (between the hours of 8 a.m. and 10 p.m. Eastern Time). Be prepared to provide the representative with the information mentioned earlier. They will guide you through the process of changing your KTN.
Be patient and persistent: It's important to note that changing your KTN with the TSA may take some time and effort. You may need to provide additional documentation, such as a copy of your passport or driver's license, to confirm your identity and update your information. It's essential to be patient and persistent in your communications with the TSA to ensure a smooth transition.
Verify the change: Once you have successfully contacted the TSA and updated your KTN, it's crucial to verify the change. Check your TSA PreCheck or other trusted traveler program account online to ensure that your new KTN is reflected correctly. This will help avoid any confusion or issues when traveling and going through the airport security process.

Remember, the TSA is there to assist you, so do not hesitate to reach out to them if you need to change your Known Traveler Number. Keep in mind that it's always a good idea to contact them well in advance of your planned travel dates to allow sufficient time for the change to be processed.

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If you are a frequent traveler, you may have already heard about the Known Traveler program. Known Traveler programs allow pre-approved travelers to enjoy expedited screening and other travel benefits. These programs include TSA PreCheck, Global Entry, Nexus, and Sentri. However, there may be instances when you need to update your Known Traveler information. In this blog post, we will guide you on how to update your Known Traveler information with airlines or trusted traveler programs.

Updating Known Traveler Information with Airlines:

Visit the airline's website: Start by visiting the website of the airline you frequently use for your travels. Look for the section that allows you to manage your reservations or profile.
Log in or create an account: If you don't have an account with the airline, create one by providing your personal information and email address. If you already have an account, log in using your username and password.
Access your reservation or profile: Once logged in, navigate to your reservations or profile page. This page typically displays your upcoming flights and personal information.
Find the option to update Trusted Traveler or Known Traveler information: Look for a section or tab related to Trusted Traveler or Known Traveler programs. The exact wording may differ depending on the airline.
Enter your Known Traveler number: Locate the field that allows you to enter your Known Traveler number. This number is assigned to you when you are approved for a Trusted Traveler program such as TSA PreCheck or Global Entry. Enter the updated number in the appropriate field.
Save or submit the changes: After entering your updated Known Traveler number, save or submit the changes to your profile. The airline's system will then update your information.

Updating Known Traveler Information with Trusted Traveler Programs:

Visit the program's website: Depending on the program you are enrolled in, visit the website of TSA PreCheck, Global Entry, Nexus, or Sentri.
Log in to your account: Use your login credentials to access your account on the program's website. If you haven't created an account yet, you will need to do so by providing your personal information and going through the application process.
Navigate to your profile: Once logged in, navigate to your profile or account settings page. This page will display your personal information and Trusted Traveler membership details.
Look for the option to update your profile: Search for a section or option related to updating your personal information or Known Traveler details. This section may be called "Profile," "Manage Membership," or something similar.
Edit your Known Traveler information: In the profile or membership management section, find the field where your Known Traveler number is displayed. Click on this field to edit or make changes.
Enter your updated Known Traveler number: Replace the existing Known Traveler number with your updated number. Double-check the accuracy of the number to ensure there are no errors.
Save or submit the changes: After entering your updated Known Traveler number, save or submit the changes to your profile. The program's system will then update your information.

It is important to note that updating your Known Traveler information with airlines or trusted traveler programs may require additional verification or documentation. Always follow the instructions provided by the airline or program to ensure a smooth update process. By keeping your Known Traveler information up-to-date, you can continue to enjoy the benefits of expedited screening and a hassle-free travel experience.

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Frequently asked questions.

To change your known traveler number, you will need to contact the airline or travel agency through which you made your reservation. They will assist you in updating your known traveler number in their system.

The ability to change your known traveler number online may vary depending on the airline or travel agency. Some airlines may allow you to update your known traveler number through their website or mobile app, while others may require you to contact their customer service.

Most airlines and travel agencies do not charge a fee for updating your known traveler number. However, it is always recommended to double-check with the specific company you booked with to confirm if any fees apply.

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The latest on the massive solar storm

By Angela Fritz, Elise Hammond and Chris Lau, CNN

Incredible lighthouse picture from Maine

From CNN's Chris Lau

A long-exposure photo shows the aurora borealis over Portland, Maine, on May 10.

Among a flurry of surreal images capturing the dazzling auroras is one taken by Benjamin Williamson of a lighthouse in Portland, Maine.

"It's one of the most incredible things I've ever seen, the awe and wonder," Williamson told CNN.

He said he used a long-exposure technique to snap the shot, but did not edit it.

Watch the full interview with Williamson here .

Things could be about to ramp up

If you still haven't seen the aurora, hold on for another 30 minutes to an hour, according to CNN meteorologist Chad Myers.

The next wave of coronal mass ejections, or CMEs, which cause the aurora, is about to arrive, he said.

"Just wait a minute because things are going to start to ramp up here," he said, adding that the increase could arrive "anytime now." "When it comes, get outside, get ready, put your coat on."

For those who are too busy to witness the phenomenon tonight, Myers said the aurora is expected to last three nights.

Why does the aurora last for a weekend?

By CNN's Chris Lau

The northern lights can be seen from Eaton Rapids, Michigan, on May 10.

Generally, it takes just eight minutes for light to travel 93 million miles to the Earth from the sun, but astrophysicist Janna Levin said the energized particles causing the current wave of aurora travel a lot slower, causing the phenomenon to last for the weekend.

"Some of these mass ejections are trillions of kilograms," she said. "They're slower. So they're taking longer, but still hours, maybe tens of hours."

Here's how the solar storm looks in the South and on the East Coast

The aurora was visible across the East Coast and in the South Friday.

Here's how it looked in Chester, South Carolina.

Down in Florida, waves of color swam through the sky.

Up north in New Jersey, a purple-ish haze could be seen in the sky.

Will solar storms get more intense and risky in the future?

The answer is probably not in the short term, according to astrophysicist Hakeem Oluseyi.

He said scientists study what is constantly happening on the surface of the sun and have found a pattern.

“Geological data shows us that in the past the sun was way more active than it is today. It has cycles where it goes very quiet ... and you have events that show that the solar activity was much, much greater,” he told CNN. “So there's no evidence that we're going to see those big maxima this cycle."

But the astrophysicist also spoke of a caveat - the limitations of modern science.

“Even though it's predictable in the short term, we still don't quite understand what creates the magnetic fields in the sun,” he said, adding: “That's why NASA has so many satellites looking at the sun.”

In Pictures: Auroras light the sky during rare solar storm

From CNN Digital's Photo Team

The northern lights glow in the night sky in Brandenburg, Germany, on May 10.

A series of solar flares and coronal mass ejections from the sun are creating dazzling auroras across the globe .

The rare solar storm may also disrupt communications. The last time a solar storm of this magnitude reached Earth was in October 2003, according to the National Oceanic and Atmospheric Administration's Space Weather Prediction Center.

See more photos of the aurora from tonight.

Behind dazzling aurora could lie “real danger,” Bill Nye the Science Guy says

Bill Nye the Science Guy speaks to CNN on Friday, May 10.

The massive solar storm could present “a real danger,” especially with the modern world relying so much on electricity, according to Bill Nye the Science Guy , a science educator and engineer.

Scientists are warning an increase in solar flares and coronal mass ejections from the sun have the potential to disrupt communication on Earth into the weekend. Solar flares can affect communications and GPS almost immediately because they disrupt Earth’s ionosphere, or part of the upper atmosphere. Energetic particles released by the sun can also disrupt electronics on spacecraft and affect astronauts without proper protection within 20 minutes to several hours.

In comparison to tonight's event, Nye drew comparisons with another incident in 1859, known as the Carrington Event, when telegraph communications were severely affected.

“The other thing, everybody, that is a real danger to our technological society, different from 1859, is how much we depend on electricity and our electronics and so on,” Nye said. "None of us really in the developed world could go very long without electricity."

He noted that there are systems in place to minimize the impact, but “stuff might go wrong,” stressing that not all transformers are equipped to withstand such a solar event.

“It depends on the strength of the event and it depends on how much of our infrastructures are prepared for this the sort of thing,” he said.

Bill Nye breaks down significance of the solar storm | CNN

This post has been updated with more details on solar flares' impact on electronics.

Here's where clouds will block the view of the northern lights in the US

From CNN's Angela Fritz

An infrared satellite image taken around 10:30 p.m. ET.

After an incredibly stormy week, most of the Lower 48 has clear skies to see the northern lights. But there are some areas where clouds and rainy weather are spoiling the view.

A deck of clouds is blocking the sky in the Northeast, from parts of Virginia into Maine, as an area of low pressure spins off the East Coast.

In the Midwest, the aurora will be hard to see through thick clouds in parts of Wisconsin, Michigan — including the Upper Peninsula — and Illinois.

A stripe of clouds is tracking across Texas, including Dallas-Forth Worth, and into Louisiana.

And in the Southwest, patchy clouds across the the Four Corners region could make the northern lights difficult to spot.

Aurora seen at least as far south as Georgia

Barely visible to the naked eye, the aurora can be seen in Atlanta in the 10 p.m. ET hour.

It is easier to see through photographs using a long exposure. The photos below, taken by CNN's Eric Zerkel and Emily Smith, used 3- and 10-second exposures.

Aurora seen in Atlanta around 10:15 p.m. ET.

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How do I use my Known Traveler Number or KTN?

Once you have been assigned a Known Traveler Number (KTN), you must include this number in the ‘KTN' field of each reservation you make with a participating airline. The KTN also can be added when booking reservations online via a participating airline website, by phone with an airline reservation agent or with the travel management company making reservations. Save your KTN to any frequent flyer profiles, employer booking systems or online travel websites that you use.

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Study: Heavy snowfall and rain may contribute to some earthquakes

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A colorful Japanese train moves through a snowy landscape near the ocean in Noto.

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When scientists look for an earthquake’s cause, their search often starts underground. As centuries of seismic studies have made clear, it’s the collision of tectonic plates and the movement of subsurface faults and fissures that primarily trigger a temblor.

But MIT scientists have now found that certain weather events may also play a role in setting off some quakes.

In a study appearing today in Science Advances , the researchers report that episodes of heavy snowfall and rain likely contributed to a swarm of earthquakes over the past several years in northern Japan. The study is the first to show that climate conditions could initiate some quakes.

“We see that snowfall and other environmental loading at the surface impacts the stress state underground, and the timing of intense precipitation events is well-correlated with the start of this earthquake swarm,” says study author William Frank, an assistant professor in MIT’s Department of Earth, Atmospheric and Planetary Sciences (EAPS). “So, climate obviously has an impact on the response of the solid earth, and part of that response is earthquakes.”

The new study focuses on a series of ongoing earthquakes in Japan’s Noto Peninsula. The team discovered that seismic activity in the region is surprisingly synchronized with certain changes in underground pressure, and that those changes are influenced by seasonal patterns of snowfall and precipitation. The scientists suspect that this new connection between quakes and climate may not be unique to Japan and could play a role in shaking up other parts of the world.

Looking to the future, they predict that the climate’s influence on earthquakes could be more pronounced with global warming.

“If we’re going into a climate that’s changing, with more extreme precipitation events, and we expect a redistribution of water in the atmosphere, oceans, and continents, that will change how the Earth’s crust is loaded,” Frank adds. “That will have an impact for sure, and it’s a link we could further explore.”

The study’s lead author is former MIT research associate Qing-Yu Wang (now at Grenoble Alpes University), and also includes EAPS postdoc Xin Cui, Yang Lu of the University of Vienna, Takashi Hirose of Tohoku University, and Kazushige Obara of the University of Tokyo.

Seismic speed

Since late 2020, hundreds of small earthquakes have shaken up Japan’s Noto Peninsula — a finger of land that curves north from the country’s main island into the Sea of Japan. Unlike a typical earthquake sequence, which begins as a main shock that gives way to a series of aftershocks before dying out, Noto’s seismic activity is an “earthquake swarm” — a pattern of multiple, ongoing quakes with no obvious main shock, or seismic trigger.

The MIT team, along with their colleagues in Japan, aimed to spot any patterns in the swarm that would explain the persistent quakes. They started by looking through the Japanese Meteorological Agency’s catalog of earthquakes that provides data on seismic activity throughout the country over time. They focused on quakes in the Noto Peninsula over the last 11 years, during which the region has experienced episodic earthquake activity, including the most recent swarm.

With seismic data from the catalog, the team counted the number of seismic events that occurred in the region over time, and found that the timing of quakes prior to 2020 appeared sporadic and unrelated, compared to late 2020, when earthquakes grew more intense and clustered in time, signaling the start of the swarm, with quakes that are correlated in some way.

The scientists then looked to a second dataset of seismic measurements taken by monitoring stations over the same 11-year period. Each station continuously records any displacement, or local shaking that occurs. The shaking from one station to another can give scientists an idea of how fast a seismic wave travels between stations. This “seismic velocity” is related to the structure of the Earth through which the seismic wave is traveling. Wang used the station measurements to calculate the seismic velocity between every station in and around Noto over the last 11 years.

The researchers generated an evolving picture of seismic velocity beneath the Noto Peninsula and observed a surprising pattern: In 2020, around when the earthquake swarm is thought to have begun, changes in seismic velocity appeared to be synchronized with the seasons.

“We then had to explain why we were observing this seasonal variation,” Frank says.

Snow pressure

The team wondered whether environmental changes from season to season could influence the underlying structure of the Earth in a way that would set off an earthquake swarm. Specifically, they looked at how seasonal precipitation would affect the underground “pore fluid pressure” — the amount of pressure that fluids in the Earth’s cracks and fissures exert within the bedrock.

“When it rains or snows, that adds weight, which increases pore pressure, which allows seismic waves to travel through slower,” Frank explains. “When all that weight is removed, through evaporation or runoff, all of a sudden, that pore pressure decreases and seismic waves are faster.”

Wang and Cui developed a hydromechanical model of the Noto Peninsula to simulate the underlying pore pressure over the last 11 years in response to seasonal changes in precipitation. They fed into the model meteorological data from this same period, including measurements of daily snow, rainfall, and sea-level changes. From their model, they were able to track changes in excess pore pressure beneath the Noto Peninsula, before and during the earthquake swarm. They then compared this timeline of evolving pore pressure with their evolving picture of seismic velocity.

“We had seismic velocity observations, and we had the model of excess pore pressure, and when we overlapped them, we saw they just fit extremely well,” Frank says.

In particular, they found that when they included snowfall data, and especially, extreme snowfall events, the fit between the model and observations was stronger than if they only considered rainfall and other events. In other words, the ongoing earthquake swarm that Noto residents have been experiencing can be explained in part by seasonal precipitation, and particularly, heavy snowfall events.

“We can see that the timing of these earthquakes lines up extremely well with multiple times where we see intense snowfall,” Frank says. “It’s well-correlated with earthquake activity. And we think there’s a physical link between the two.”

The researchers suspect that heavy snowfall and similar extreme precipitation could play a role in earthquakes elsewhere, though they emphasize that the primary trigger will always originate underground.

“When we first want to understand how earthquakes work, we look to plate tectonics, because that is and will always be the number one reason why an earthquake happens,” Frank says. “But, what are the other things that could affect when and how an earthquake happens? That’s when you start to go to second-order controlling factors, and the climate is obviously one of those.”

This research was supported, in part, by the National Science Foundation.

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A new study conducted by MIT researchers suggests “heavy snowfall could be a factor in triggering swarms of earthquakes,” reports Evan Bush for NBC News . "Those big snowfall events seem to correlate well with the start of these big earthquake swarms," says Prof. William Frank. "We shouldn’t forget the climate itself can also play a role in changing the stress state at depth where earthquakes are happening."

BBC Science Focus

BBC Science Focus reporter Alex Hughes spotlights a new study by MIT scientists that suggests more heavy snowfall and rain linked to climate change could increasingly contribute to earthquakes worldwide. “The researchers made these conclusions based on how weather patterns in northern Japan have seemingly contributed to a new 'swarm' of earthquakes,” writes Hughes, “a pattern of multiple, ongoing quakes – that is thought to have begun in 2020.”

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Q&A: What sets the recent Japan earthquake apart from others?

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In Wildwood, Donald Trump makes false claim about Penn protests, blasts Chris Christie and Larry Krasner

Trump showed up late, but addressed a large crowd of supporters on the beach about six months ahead of the 2024 election.

Republican presidential candidate former President Donald Trump gestures to the crowd during a campaign rally in Wildwood, N.J., Saturday, May 11, 2024.

Former president Donald Trump spoke for over 90 minutes at a 2024 election rally in Wildwood , N.J. Saturday.

Trump made several inaccurate statements during his speech, including falsely claiming there were riots at the University of Pennsylvania stemming from protests on campus.

Trump, the presumptive Republican nominee for president, finished Day 15 of his hush-money trial in New York on Friday . It is one of four indictments the former president faces.

Three Wildwood officials, including Mayor Ernie Troiano, face indictments that allege they defrauded the state’s health care system .

New Jersey's primary elections are on June 4. Four Republicans and three Democrats are vying for the Senate seat currently held by Robert Menendez, who may run as an independent.

Wildwood rally shows Trump’s base has only grown louder and prouder since 2016

As former President Donald Trump stood on a stage in the sand in Wildwood, he spoke to a sea of his fiercest fans gathered at the foot of Wildwood’s famous Great White roller coaster.

They poured onto the Wildwood beach hours earlier. Many came in pickup trucks decked out in Trump flags, with license plates from up and down the East Coast.

Trump supporter skipped her kids' dance performance to attend speech

Following Donald Trump's speech, Sally Payano, 46, said she chose to come to his Wildwood rally instead of going to her 3 and 5-year-old children’s dance performance.

“If we don't fix this country, my kid won’t have a future,” she said, sporting a pink Trump hat. “So I had to come here and support President Trump so when my 5 year old, 3 year old, and 6 year old get older like me they will have America. A free America, a healthy America, and a great America like it's supposed to be.”

Trump wraps up Wildwood speech after more than 90 minutes

Donald Trump wrapped his speech in Wildwood a little before 8 p.m., more than 90 minutes after taking the stage.

The sun had started to set and the crowd had thinned by the time he left the stage.

Trump blasts Philly DA Larry Krasner and promises to give cops ‘immunity’

Donald Trump pledged to give members of law enforcement ‘immunity’ so they don’t ‘get sued and lose their families, lose their homes, lose their pensions.’

It’s unclear how he would go about that but Trump has made the pledge since December, seeming to promote a model of policing in which officers can take strong actions without worry of being held liable for their conduct.

Trump's Wildwood crowd begins to leave early during his speech

The crowd that stretched to the back fences of Donald Trump's beachfront rally is beginning to noticeably thin around 45 minutes after he took the stage.

Rallygoers held up MAGA signs as they exited the area.

Trump falsely claims he's been indicted more than famed mobster Al Capone.

During his rally in Wildwood, Donald Trump once again repeated a common but apparently false message he's shared on the campaign trail – that he's been indicted more than mobster Al Capone.

Trump is facing four indictments – two federal, two state, including a New York business fraud case currently on trial in Manhattan.

Trump repeatedly refers to Chris Christie as a 'fat pig'

Donald Trump asked the Wildwood crowd if anyone liked former New Jersey Gov. Chris Christie, the crowd roared “No!”

Trump followed by saying he heard someone call him a “fat pig,” drawing laughs from the audience. Some broke into a chant of “fat pig!”

Trump falsely claims there were riots at Penn

Donald Trump falsely claimed there were riots at the University of Pennsylvania, where the school called in police to end an encampment set up by pro-Palestinian protesters.

"I went to school in Pennsylvania," Trump, a 1968 Wharton graduate, told supporters in Wildwood Saturday. "They're rioting in front of my school all the time. What's going on here?"

Trump takes the stage at Wildwood

President Donald Trump has taken the stage in Wildwood at about 6:20 p.m. He waved to supporters wearing a Make America Great Hat as 'Proud to be an American,' played over the PA system. Some attendees have been on the Wildwood beach since noon awaiting his appearance.

"We love Wildwood," Trump said. He then pledged he would win the state of New Jersey, which has voted Democratic in the presidential election for the last seven elections.

'Give me Trump!': Supporters getting antsy at former president's delayed arrival

After standing for hours and expecting Donald Trump at 5 p.m., attendees were antsy during a narrative-heavy speech by retired British soldier Christian Craighead’s speech around 6 p.m.

Early on in the speech, the crowd clapped and chanted “USA!” while he spoke.

First speaker is Doug Burgum, an unlikely candidate to become Trump's VP

Kicking off Saturday's rally is North Dakota Gov. Doug Burgum, who has emerged as an "unlikely candidate" to become Donald Trump's running mate, as Politico put it this week.

Burgum's own presidential run was short-lived – he dropped out of the Republican primary in December after garnering very little support. But he endorsed Trump way back in May 2016 and again in January.

Trump running late, expected to speak shortly

Trump was expected to speak at 5 p.m., but the the stage remained empty at 5:30 p.m.

Attendees have been on their feet for hours, with the venue opening at noon.

Trump repeats call to debate Biden, despite neither committing to the schedule

Ahead of his Wildwood rally, a Donald Trump campaign staffer handed out a printout of a March Truth Social post by the former president calling for a debate with Joe Biden. The post was distributed to members of the media and projected on the screens at the rally.

A voice recording played of Trump speaking, starting off by saying he’s ready to debate and ranting about Biden.

Photos: Trump supporters show up in Wildwood

New hampshire couple show their support for trump.

New Hampshire natives Jack Currier, an engineer, and his wife, Kelly Carter-Currier, a retired teacher, both 62, came to the Wildwood boardwalk Saturday to show support for Donald Trump and hoped to listen to his speech apart from the rally crowd, rather than spend a lot of time standing around.

Currier was wearing a rubber ducky zip-tied to his hat, and his wife, Carter-Currier was prominently displaying a neck piece that featured a New Hampshire license plate emblazoned with “TRUMP.”

Speakers tell rally goers to vote by mail, despite Trump's claims that it's rigged

Republican leaders have been trying to get their supporters to vote by mail, but their sentiments are often contradicted by Donald Trump, who regularly decries the practice and falsely claims that mail voting is corrupt.

» READ MORE: The Pa. GOP is desperate to fix the perception issue over mail voting

Pre-rally entertainment at the Trump rally

Shortly after 2 p.m., “America the Beautiful” played as a man painted an American flag live on stage. He then pulled down from the canvas revealing a portrait of a muscular Donald Trump sporting a “47” T-shirt.

— Aliya Schneider

Sunbathing at the Trump rally

Donald Trump signs haven't been in short supply in Wildwood since the 2016 election, but Saturday's rally took the sloganeering to another level.

Two supporters draped in a black flag walked arm in arm toward Trump's beachfront gathering around 2 p.m. Their sign read: "I'm just glad to be on the side that believes in God, has the most guns, and knows which restroom to use."

Trump supporters descend on Wildwood

Couples and families wearing Trump apparel are easy to spot on the Wildwood boardwalk, with some supporters opting to travel the Shore town in golf carts.

One man walked down the boardwalk shouting, “Biden sniffs children.”

Watch: Why Donald Trump is coming back to Wildwood

— Jenna Miller

Donald Trump rally in Wildwood, N.J.: Start time, how to watch and stream

Former President Donald Trump will return to Wildwood, N.J. today to hold a political rally a little less than six months ahead of the 2024 election.

Trump held a huge rally in Wildwood in January 2020, and was accused by then-mayor Pete Byron of not reimbursing the town for costs associated with the event . This time around, Trump's campaign has already paid $54,000 upfront to cover law enforcement support, according to current Wildwood Mayor Ernie Troiano Jr.

Trump's rally in Wildwood a break from the courtroom

After a long week in court, Donald Trump is heading to the Jersey Shore. And his campaign says he’ll be joined by “tens of thousands” of his friends.

Trump, the presumptive Republican presidential nominee, expects to draw what his team is calling a “mega crowd” to a Saturday evening rally in the southern New Jersey resort town of Wildwood. It will be held 150 miles south of the New York City courthouse where he has been forced to spend most weekdays sitting silently through his felony hush money trial.

Democrats warn Trump New Jersey 'is not going to be a welcoming place'

U.S. Rep. Mikie Sherrill, a Democrat who represents parts of northern New Jersey, said she expects a lot of people at Donald Trump's rally in Wildwood Saturday will be coming from elsewhere because of the former president's reputation in the Garden State.

“Jersey is not going to be a welcoming place for Trump,” she said in a press call with President Joe Biden’s campaign on Friday.

Wildwood’s mayor invited Donald Trump to use the beach. Here's why.

On a bitterly cold January day in 2020, former President Donald Trump packed the Wildwood Convention Center with supporters at one of his biggest rallies of the last presidential campaign.

Four years later, Wildwood Mayor Ernie Troiano Jr. learned Trump wanted a reprise but the old venue was unavailable. He offered another idea:

Like Trump, Wildwood's mayor Ernie Troiano Jr. is also facing legal troubles

The last time Donald Trump came to Wildwood, Pete Byron, a Democrat, was the newly elected mayor . Byron said he was banned by Rep. Jeff Van Drew from attending the Trump rally , despite supporting it as an economic driver for the town then.

Byron’s election seemed to represent a shift away from Trumpism and Troiano, who had been mayor for 19 years. But Byron resigned in September 2023 after he was sentenced following his guilty plea for to tax fraud in federal court.

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Known Traveler Number Guide: (How to Lookup, Global ...
A Known Traveler Number, also called your "KTN," is a 9-digit number used to link your TSA Pre-Check enrollment to your travel itinerary in order to ensure that you can receive TSA Pre-Check benefits like expedited security screening. This is the same number used for other trusted traveler programs, such as Global Entry, NEXUS, and SENTRI.
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A Known Traveler Number (KTN) is issued to all individuals approved to receive TSA PreCheck® expedited screening. The KTN must be added in the KTN field when booking airline travel reservations to have the TSA PreCheck® indicator appear on your boarding pass. For members approved for the TSA PreCheck® Application Program, this number is 9 or ...
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Go to the airline's website or mobile app. Pull up your reservation using the confirmation number (or record locator) the airline gave you when you booked your trip. Then, go to the traveler information section. There should be a line that says "Known Traveler Number," "KTN" or "Secure Traveler Information." That's where you put your KTN.
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If you are a member of the TSA PreCheck® Application Program, look up your Known Traveler Number (KTN) here. If you are a member of another trusted traveler program, such as Global Entry, NEXUS, or SENTRI, log on to the Trusted Traveler Program website to obtain your PASSID, which is your KTN.. If your TSA PreCheck® benefits come through HME, TWIC®, or DoD, please visit these respective ...
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Please enter your information below (letters, spaces, hyphens (-), and apostrophes (') are allowed in name fields). Then click "Submit" to retrieve your KTN. This tool is for TSA PreCheck® Application Program members only. Global Entry, NEXUS or SENTRI members may retrieve their PASSID (which serves as the KTN) at the Trusted Traveler Program ...
Record-Breaking Road Trip Weekend Slated For Memorial Day
This year will be big for road trips: AAA projects 38.4 million people will travel by car, up 1.9% from the 2019 holiday weekend and the highest number since AAA started tracking in 2000.
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Ensure a seamless travel experience with updated identification. 525 Main St, Worcester, MA 01608 ... staying on top of your Known Traveler Number is essential for a seamless travel experience. ... By keeping your Known Traveler information up-to-date, you can continue to enjoy the benefits of expedited screening and a hassle-free travel ...
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With pandemic-era travel restrictions now long in the rearview mirror, interest in traveling to mainland China is picking back up for international visitors. However, a fair number of people are deterred because of the perceived difficulties in obtaining a visa. ... However, China recently opened up the policy to a number of major European ...
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I94
International travelers visiting the United States can apply for or retrieve their I-94 admission number/record (which is proof of legal visitor status) as well as retrieve a limited travel history of their U.S. arrivals and departures. Apply For New I-94 (Land Border/Selected Ferry. Travelers Only) Get Most Recent I-94. View Travel History.
Aurora lights up the sky in geomagnetic storm
Aurora seen in Atlanta area around 10:30 p.m. ET. (Emily Smith/CNN) A stunning aurora, caused by a severe geomagnetic storm, is painting the sky shades of pink, purple and green as it spreads into ...
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Study: Heavy snowfall and rain may contribute to some earthquakes
With seismic data from the catalog, the team counted the number of seismic events that occurred in the region over time, and found that the timing of quakes prior to 2020 appeared sporadic and unrelated, compared to late 2020, when earthquakes grew more intense and clustered in time, signaling the start of the swarm, with quakes that are ...
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Donald Trump rally today in Wildwood, N.J.: Highlights, speakers, updates
President Donald Trump has taken the stage in Wildwood at about 6:20 p.m. He waved to supporters wearing a Make America Great Hat as 'Proud to be an American,' played over the PA system. Some attendees have been on the Wildwood beach since noon awaiting his appearance. "We love Wildwood," Trump said.
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