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You will want your Known Traveler Number (KTN) in order to add TSA PreCheck to your Japan Airlines (JAL) reservation. How To Add TSA Precheck To Japan Airlines Go to the "Manage Booking" portion of the website or app, or log into your JAL account. Locate your reservation and look for the "Known Traveler Number" or "TSA PreCheck" field in the passenger details section. Input your KTN and apply the modifications. If problems arise, get in touch with JAL customer support. Before leaving for the airport, make sure your boarding pass has the TSA PreCheck emblem on it and that it has been uploaded successfully.