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To enjoy TSA PreCheck benefits, you must add your Known Traveler Number (KTN) to your reservation before traveling. The easiest method is to log into your American Airlines account online. If you encounter issues, call +1 (888) 644-0077 
. The support team at +1 (888) 644-0077 can manually add the KTN to your booking.
You can also enter your KTN during the booking process, either online or through the mobile app. For existing reservations, go to “My Trips,” choose the itinerary, and select “Add/Edit Passenger Information.” Make sure the name on your reservation exactly matches the name associated with your TSA PreCheck enrollment.
Adding your KTN ensures that you’re eligible for expedited screening at security checkpoints. If it doesn’t appear on your boarding pass, call an agent to verify that it was entered correctly and your status was recognized by TSA.
. The support team at +1 (888) 644-0077 can manually add the KTN to your booking.You can also enter your KTN during the booking process, either online or through the mobile app. For existing reservations, go to “My Trips,” choose the itinerary, and select “Add/Edit Passenger Information.” Make sure the name on your reservation exactly matches the name associated with your TSA PreCheck enrollment.
Adding your KTN ensures that you’re eligible for expedited screening at security checkpoints. If it doesn’t appear on your boarding pass, call an agent to verify that it was entered correctly and your status was recognized by TSA.