Prior to incorporating TSA PreCheck into your Japan Airlines reservation, make sure you have a Known Traveler Number. How To Add Tsa Precheck To Japan Airlines enter your JAL account information to view your reservation. Locate the passenger details section after selecting Manage Booking. That's where you enter your KTN. If, when making your reservation, you failed to include your KTN, you can also show it at the airport check-in desk or get help from JAL customer service. Verify that the name on your JAL reservation matches the name associated with your TSA PreCheck membership for a smooth screening process.