How To Add TSA Precheck To Japan Airlines? This article explains where and how to enter your Known Traveler Number, from updating your booking online to changing your frequent flyer account. Flying doesn't have to be a hassle—learn the process of adding TSA PreCheck to your JAL reservation and minimize wait times at U.S. airports. Streamline your travel and stress less with this informative how-to. Visit us: https://www.tripwithflight.com/blog/how-to-add-tsa-precheck-to-japan-airlines/