Where to enter your TSA PreCheck number on American Airlines

You add your TSA PreCheck number to American Airlines through your online account or at the airport check-in counter. The easiest route is your American Airlines profile on their website or mobile app, where you can store it permanently so it appears on every future booking. Once saved, the number travels with your reservation and tells TSA agents at security that you have already been vetted.

American Airlines calls this information your "Known Traveler Number" or KTN. The airline uses it to link your boarding pass to your TSA PreCheck status, which means you will see a TSA PreCheck indicator on your boarding pass at check-in. That indicator is what gets you into the shorter security line.

Key Takeaways

  • Your TSA PreCheck number (also called your Known Traveler Number) goes into your American Airlines frequent flyer profile under the "Traveler Information" or "Known Traveler Number" section.
  • You can add it online through aa.com or the American Airlines mobile app, or tell an agent at the airport ticket counter before you check in.
  • Once stored in your profile, the number automatically appears on every boarding pass you print or receive, so you do not have to re-enter it for each flight.
  • The TSA PreCheck indicator will show on your boarding pass only if your number is correctly linked to your reservation before you reach security.

Steps to add your TSA PreCheck number online

Log into your American Airlines account at aa.com using your username and password. If you do not have an account, create one first—you will need an AAdvantage number, which is American's frequent flyer program ID. Once logged in, look for "My Profile" or "Account Settings," usually found in the upper right corner or in a menu labeled "Manage My Booking."

Find the section labeled "Traveler Information," "Known Traveler Number," or "TSA PreCheck." The exact wording varies depending on whether you are on the website or the app, but it will be near your name and passport information. Click "Add" or "Edit," then paste or type your TSA PreCheck number exactly as it appears on your TSA approval letter. Do not add spaces, dashes, or extra characters—enter only the nine-digit number. Save your changes.

The same process works in the American Airlines mobile app. Open the app, tap your profile icon, select "Traveler Information," and enter your TSA PreCheck number in the Known Traveler Number field. Save and close. Your number is now stored and will appear on all future bookings under that AAdvantage account.

Adding your TSA PreCheck number through the mobile app

The American Airlines app is often faster than the website if you are on your phone. Open the app and tap the profile or account icon—usually at the bottom right or top left depending on your device. Select "Profile" or "Account Settings," then scroll to find "Known Traveler Number" or "Traveler Information."

Tap the field and enter your nine-digit TSA PreCheck number. Double-check that you have typed it correctly, because a single wrong digit will prevent the TSA PreCheck indicator from showing on your boarding pass. Tap "Save" or "Done." The app will confirm the change has been saved. You can now close the app—your number is stored and will be used on your next booking.

What to do if you do not have your TSA PreCheck number yet

If you have been approved for TSA PreCheck but have not received your Known Traveler Number, check your email for a message from TSA. The approval letter contains your nine-digit number and is usually sent within 24 hours of your background check clearing. Search your inbox and spam folder for mail from "tsa.gov" or "universal-enrollment.com."

If you cannot find the email, visit the TSA's official website at tsa.gov and log into your account using the same credentials you used when you applied. Your Known Traveler Number will be displayed in your account dashboard. Write it down or take a screenshot before you add it to American Airlines. If you have not yet applied for TSA PreCheck, you will need to complete that process first—it takes about 10 to 15 minutes online and costs $78 to $85 for five years.

Timing: when the TSA PreCheck indicator appears on your boarding pass

The TSA PreCheck indicator will show on your boarding pass only if your number is correctly linked to your reservation before you check in. If you add your number to your profile today, it will appear on all future bookings automatically. If you have already booked a flight and just added your number, the indicator may not appear on your existing reservation—you may need to check in again online or at the airport to refresh your boarding pass.

At the airport, if your boarding pass does not show the TSA PreCheck indicator even though your number is in your profile, tell the agent at the ticket counter. They can manually add it to your reservation. This usually takes less than a minute. Once your boarding pass is updated, you can proceed to the TSA PreCheck security line.

Common mistakes that prevent the TSA PreCheck indicator from showing

The most common error is typing your TSA PreCheck number incorrectly. A single digit wrong—or an extra space or dash—will cause the system to reject it. Always copy and paste your number directly from your TSA approval email or your TSA account, rather than typing it by hand. If you have already entered it and your boarding pass still does not show the indicator, delete what you entered and try again with the correct number.

Another mistake is adding the number to the wrong account. If you have multiple AAdvantage accounts or use different email addresses for different bookings, make sure you are logged into the account you will use to book your flight. Your TSA PreCheck number is tied to that specific AAdvantage account, not to your name or email address. If you book under a different account, the number will not be linked to that reservation.

A third issue is booking as a guest without an AAdvantage account. If you purchase a ticket without logging in, American Airlines will not have your TSA PreCheck number on file. Always log into your AAdvantage account before you book, or add your number to your profile when ready after booking if you forgot to log in first.

What happens at security if your TSA PreCheck indicator is on your boarding pass

When you reach the TSA security checkpoint, show your boarding pass to the agent. If the TSA PreCheck indicator is visible, they will direct you to the TSA PreCheck lane, which is usually shorter and moves faster than the standard line. In the TSA PreCheck lane, you can keep your shoes, belt, and light jacket on, leave your laptop and liquids in your bag, and go through security more quickly.

If your boarding pass does not show the indicator but you have a valid TSA PreCheck membership, tell the officer. They can manually verify your status using your ID and may allow you through the PreCheck lane anyway, though this is not may provide. This is why it is important to add your number to your profile before you travel—it ensures the indicator is printed on your pass and you do not have to explain anything at security.

Frequently Asked Questions

Can I add my TSA PreCheck number after I have already booked my flight?

Yes. Add it to your profile anytime, and it will appear on your boarding pass the next time you check in online or at the airport. If you have already checked in and printed your boarding pass, you may need to check in again online or ask an agent at the ticket counter to reissue your pass so the indicator appears.

What if I have multiple AAdvantage accounts?

Add your TSA PreCheck number to each account separately. Your number is tied to the specific AAdvantage account you use to book, so if you have two accounts, you will need to enter your number in both. Always log into the account you plan to use before you book your flight.

Do I need to add my TSA PreCheck number to American Airlines if I already have TSA PreCheck?

Yes. Having TSA PreCheck does not automatically link it to your airline reservations. You must add your number to your American Airlines profile so the airline can include it on your boarding pass. Without that link, TSA will not know you have PreCheck when you reach security.

What if I lose my TSA PreCheck number?

Log into your TSA account at tsa.gov using your username and password. Your Known Traveler Number will be displayed in your account dashboard. You can also call the TSA at 1-855-347-8371 to request your number by phone.

Will adding my TSA PreCheck number to American Airlines affect other airlines?

No. Your TSA PreCheck number is the same across all airlines, but you must add it separately to each airline's frequent flyer program or account. Adding it to American Airlines does not add it to United, Delta, Southwest, or any other carrier. You will need to repeat the process for each airline you fly with regularly.