How to Add TSA Precheck to Turkish Airlines? To add TSA Precheck to your Turkish Airlines reservation, you need to follow a few steps for a seamless travel experience. Firstly, ensure that you are eligible for TSA Precheck by being a U.S. citizen or lawful permanent resident. Next, apply and complete the online application process on the Transportation Security Administration (TSA) website, which includes providing your personal information and payment of the non-refundable fee. Once approved, make sure to enter your Known Traveler Number (KTN) in the «Secure Flight Passenger Data» section when booking your Turkish Airlines ticket or update it in your existing reservation.