How Do I Add My Known Traveler Number to An Airline Reservation? If you received your KTN after booking an existing airline reservation, you may add it at the boarding counter, or at the self-service kiosk at the airport.

Yes, you can add your Known Traveler Number (KTN) to your ticket at the airport, but it must be done at the airline check-in counter, not at the security checkpoint. The gate agent or ticket agent can manually enter your KTN into your reservation and re-print your boarding pass so that the TSA PreCheck logo appears. However, doing this at the last minute is not guaranteed to work instantly, as the airline's system must communicate with the TSA's database to verify your status. If you have already cleared security, it is too late to use the PreCheck lane for that specific departure. In 2026, most airlines allow you to add your KTN via their mobile app even after booking, which is highly recommended to ensure the status is correctly embedded in your digital boarding pass before you ever arrive at the terminal, saving you from waiting in a potentially long "Full Service" check-in line.