Add your TSA PreCheck number when you book or after

You can add your TSA PreCheck Known Traveler Number (KTN) to an American Airlines ticket in two ways: during booking or after you've already purchased your ticket. The fastest route is to enter it at checkout when you first buy your flight. If you forget, you can log into your American Airlines account, find the reservation, and add it before you check in — American allows changes up to 24 hours before departure.

Your TSA PreCheck number is a nine-character code you receive when you enroll in the TSA PreCheck program through the TSA's official enrollment centers. You'll need this exact number to link it to your airline ticket. Without it, the airline has no way to connect you to your TSA PreCheck status at the airport.

Adding your number to your ticket does not cost extra and does not change your fare. It straightforward tells the TSA and American Airlines that you are enrolled in the program so you can use expedited security lanes when you travel.

Key Takeaways

  • Enter your nine-character TSA PreCheck number during American Airlines checkout, or add it to an existing reservation through your account up to 24 hours before departure.
  • Your TSA PreCheck number comes from the TSA's official enrollment program and is different from your American Airlines frequent flyer number.
  • Adding your number to your ticket is free and takes less than a minute if you have your KTN ready.
  • If you do not add your number before you check in, you can still use TSA PreCheck at the airport if you show your physical TSA PreCheck card or your enrollment receipt.

Add TSA PreCheck during American Airlines booking

When you are on the American Airlines website or app and have selected your flight, look for a field labeled "Known Traveler Number" or "KTN" during the passenger information step. This field usually appears after you enter your name, date of birth, and gender. Enter your nine-digit TSA PreCheck number exactly as it appears on your TSA PreCheck card or enrollment confirmation.

If you are booking through a travel agent or a third-party site like Expedia or Kayak, the option to add your KTN may not be available at checkout. In that case, you will need to add it to your American Airlines reservation after the ticket is issued. Do this as soon as you receive your confirmation email, because the sooner your number is in the system, the sooner it syncs with TSA databases.

Double-check that you have entered your number correctly before you complete your purchase. A single wrong digit will prevent the TSA from recognizing your PreCheck status at security.

Add TSA PreCheck to an existing American Airlines reservation

Go to aa.com or open the American Airlines app and select "Manage My Booking." Enter your confirmation number and last name, or log into your American Airlines account if you have one. Find the reservation you want to update and look for an option to edit passenger information or add frequent flyer or known traveler details.

Click on the passenger name and look for a field for "Known Traveler Number" or "KTN." Enter your nine-digit TSA PreCheck number and save your changes. The system will confirm that your number has been added. This update usually takes effect within minutes, though it can take up to 24 hours to sync with TSA systems.

You can make this change at any time before you check in, but the TSA recommends adding your number at least 24 hours before your flight to may support it appears in their system when you arrive at security.

What happens if you forget to add your number before the flight

If you reach the airport without adding your TSA PreCheck number to your ticket, you can still use TSA PreCheck security lanes if you show your physical TSA PreCheck card or your enrollment receipt. The TSA will verify your status manually, though this may take slightly longer than if your number was already in the system.

For future flights, add your number as soon as you book. This prevents any delays or confusion at the airport and ensures the TSA recognizes your status before you arrive at security.

Make sure you have the right number

Your TSA PreCheck number is not the same as your American Airlines frequent flyer number, your driver's license number, or your passport number. It is a unique nine-character code that the TSA assigns when you complete enrollment. You can find it on your TSA PreCheck card, in your TSA PreCheck enrollment confirmation email, or by logging into your TSA PreCheck account at tsa.gov.

If you have lost your TSA PreCheck card or cannot find your number, visit tsa.gov and log into your account using your email and password. Your KTN will be displayed on your account dashboard. If you do not have an account, you may need to re-enroll or contact the TSA enrollment center where you originally applied.

Frequently Asked Questions

Can I add TSA PreCheck to my ticket after I check in online?

No. You must add your TSA PreCheck number before you check in. Once you have checked in, the passenger information is locked and cannot be changed. Check in online 24 hours before your flight and add your KTN before that window closes.

What if I enter the wrong TSA PreCheck number?

Contact American Airlines customer service and provide your confirmation number. They can correct the number in your reservation. Do this as soon as you notice the error so the correction syncs with TSA systems before your flight.

Do I need to add my TSA PreCheck number to every American Airlines flight I book?

Yes. Each ticket is separate, so you must add your KTN to every reservation. If you enroll in American Airlines AAdvantage frequent flyer program, some accounts allow you to save your KTN as a default, which will auto-populate on future bookings — check your account settings to see if this option is available.

Will adding my TSA PreCheck number change my seat or fare?

No. Adding your KTN does not affect your ticket price, seat assignment, or any other part of your reservation. It is purely informational and tells the TSA you are enrolled in the program.