A KTIN, or Known Traveler Identification Number or Known Traveler Number, is a unique ID assigned to you once you applied for the TSA PreCheck program, but should you use a similar traveler program, such as Global Entry, NEXUS, or SENTRI, your KTN is referred to as your PASSID. The PreCheck program can make your airport visit more convenient, as you will have a screening lane where you will not have to remove your belts, shoes or jacket, nor remove a laptop from its bag. Many airlines have a PreCheck program, but this guide will advise you on helping you add your KTN to your Delta booking.
If you are chosen for TSA PreCheck, your boarding pass will have a PreCheck indicator. This includes paper or digital boarding passes.
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