Mumbo jumbo by a "security specialist" ... Forbes: The TSA Magic Number to Get Through Security Faster TSA has made the procedure really simple so that the airlines and security checkpoints will recognize that you are in the program and pre-cleared. When you make your reservation, enter your PASS ID number in the “Known traveler number” field in the space provided by the airline in the Frequent Flier area of the reservation. This number is then generated as part of the barcode on your boarding pass and is now recognized by TSA when they scan your ticket. The ID number is in the top-left corner of your government-issued Nexus, Sentri, or Global Entry card. So long as your name, date of birth and PASS ID match, the system will pre-clear you. The system will pre-clear you? Always? I don't think so.