How to link TSA PreCheck or CLEAR to your American Airlines booking

You add TSA PreCheck or CLEAR to an American Airlines reservation by entering your Known Traveler Number (KTN) during booking or by adding it to your existing reservation afterward. American Airlines does not issue these credentials—you obtain them directly from the Transportation Security Administration (TSA) or from CLEAR, a private company that partners with TSA. Once you have your KTN from either program, you can store it in your American Airlines frequent flyer profile so it appears automatically on future bookings.

The process takes just a few minutes and costs nothing beyond what you already paid for TSA PreCheck or CLEAR. The benefit is that TSA officers at the checkpoint will see your status and direct you to the appropriate security lane, which can save time on travel days.

Key Takeaways

  • You must obtain TSA PreCheck or CLEAR directly from TSA or CLEAR before you can add it to American Airlines—the airline does not issue these programs.
  • Your Known Traveler Number (KTN) is the credential you enter into American Airlines; TSA PreCheck KTNs start with letters, while CLEAR uses a different format.
  • You can add your KTN during booking on aa.com, through the American Airlines app, or by editing an existing reservation up to 24 hours before departure.
  • Storing your KTN in your AAdvantage frequent flyer profile means it will populate automatically on all future bookings without re-entering it each time.

Getting your Known Traveler Number before you book

TSA PreCheck and CLEAR each issue a different type of credential. If you have TSA PreCheck, your Known Traveler Number is a combination of letters and numbers that TSA provides when your background check clears. You can find it in your TSA PreCheck approval email, on the TSA website under "Manage Your TSA PreCheck," or on any boarding pass you received after enrolling. If you have CLEAR, your membership number serves as your KTN and appears in your CLEAR app or confirmation email.

Do not confuse your KTN with your passport number, driver's license number, or frequent flyer number—American Airlines needs the specific credential from TSA or CLEAR. If you do not yet have either program, you can enroll in TSA PreCheck through the TSA website or at an enrollment center, or sign up for CLEAR through the CLEAR website. Both programs charge a fee and require an in-person appointment or identity verification.

Adding your KTN during a new booking on aa.com

When you book a flight on aa.com or the American Airlines app, you will see a field labeled "Known Traveler Number" or "TSA/CLEAR" on the passenger details page. Enter your KTN exactly as it appears in your TSA or CLEAR documentation—spaces and hyphens matter. The field appears for each passenger, so if you are traveling with family members who also have TSA PreCheck or CLEAR, add their KTNs as well.

After you enter the KTN and complete your booking, it will appear on your confirmation email and boarding pass. You do not need to do anything else; TSA will see it at the checkpoint and route you accordingly.

Adding your KTN to an existing reservation

If you already booked a flight without entering your KTN, you can add it up to 24 hours before departure. Log into your American Airlines account, find your reservation under "Manage My Booking," and select "Edit Passenger Information." Enter your KTN in the designated field and save your changes. The updated information will appear on your next boarding pass printout or mobile boarding pass.

If you are within 24 hours of departure and cannot edit online, call American Airlines at 800-433-7300 and provide your confirmation number and KTN. A representative can add it to your reservation over the phone, though you may need to show your TSA PreCheck or CLEAR credential at the airport.

Storing your KTN in your AAdvantage profile for future flights

To avoid entering your KTN on every booking, save it to your AAdvantage frequent flyer profile. Log into aa.com, go to "My Account," and select "Profile Settings" or "Traveler Information." Look for a field labeled "Known Traveler Number," "TSA PreCheck," or "CLEAR" and enter your KTN. American Airlines will then auto-populate this number on all future bookings under your name.

You can update or remove your KTN from your profile at any time. If your TSA PreCheck or CLEAR expires and you renew it, you will receive a new KTN—log back into your profile and update it so your new credential appears on upcoming reservations.

What happens at the airport if your KTN is on your reservation

When you arrive at security with a boarding pass that shows your KTN, TSA officers will check it against their database. If your TSA PreCheck or CLEAR status is active and valid, you will be directed to the TSA PreCheck lane (shorter lines, shoes and belt stay on, laptops stay in bags) or the CLEAR lane (biometric scan, no documents needed). If your status has expired or the KTN does not match TSA records, you will go through standard security screening.

Bring your physical TSA PreCheck card or CLEAR membership card to the airport as backup, though the KTN on your boarding pass is usually sufficient. If there is any confusion at the checkpoint, showing your credential card will resolve it quickly.

Troubleshooting: KTN not appearing on your boarding pass

If you entered your KTN but it does not show on your boarding pass, check that you typed it correctly—even a single wrong character will cause it to drop off. Log back into your reservation and verify the entry matches your TSA or CLEAR documentation exactly. If it still does not appear, delete it and re-enter it, then save again.

If the KTN appears on your confirmation email but not on your mobile boarding pass, try refreshing the app or downloading your boarding pass again. For paper boarding passes printed at home or at the airport, the KTN may not always display on the barcode section but will still be in the airline's system—TSA can look it up using your name and confirmation number if needed.

Frequently Asked Questions

Do I need TSA PreCheck or CLEAR to fly American Airlines?

No. TSA PreCheck and CLEAR are optional programs that speed up security screening. You can fly American Airlines without either one; you will straightforward go through standard TSA screening. Adding your KTN is only useful if you already have an active TSA PreCheck or CLEAR membership.

Can I use someone else's KTN on my reservation?

No. The KTN must match the name on your boarding pass and passport. TSA will verify the KTN against your identity at the checkpoint, so using another person's number will cause delays or denial of TSA PreCheck benefits.

What if my TSA PreCheck or CLEAR expires while I have a flight booked?

Your KTN will no longer work at the checkpoint once your membership expires. If you renew before your flight, you will receive a new KTN—update it in your American Airlines reservation and profile. If you do not renew, you will go through standard security screening even though the old KTN is on your boarding pass.

Can I add my KTN to a flight booked through a travel agent or third-party website?

If you booked through a travel agent or site like Expedia, you may not be able to edit the reservation on aa.com. Contact the travel agent or the website where you booked and ask them to add your KTN, or call American Airlines with your confirmation number and they can add it if the reservation is in their system.

Does adding my KTN cost extra?

No. Adding your KTN to an American Airlines reservation is free. You pay only for TSA PreCheck or CLEAR itself, which are separate programs with their own fees.