When making your Japan Airlines reservation, provide your Known Traveler Number (KTN) in the Secure Flight box to enable TSA PreCheck. How To Add Tsa Precheck To Japan Airlines if you've already made a reservation, you can add your KTN online or by calling Japan Airlines' customer support. Make sure the name on your ticket and your TSA PreCheck profile match. You will be qualified for faster security screening at US airports that take part in TSA PreCheck as soon as the KTN is applied.