Many travelers wonder How To Add TSA Precheck To Lufthansa Airlines? Reservation, start by confirming that your Known Traveler Number (KTN) is active. Log in to your Lufthansa account, go to your profile or booking details, and enter your KTN in the passenger information section to link your TSA PreCheck benefits to your reservation. If booking through a travel agent or over the phone, provide your KTN during the reservation process. At check-in, make sure the TSA PreCheck symbol appears on your boarding pass for streamlined security screening.