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ANSWER: According to the TSA, "The PASSID is assigned to you when you enroll in Global Entry, Nexus or SENTRI. This nine-digit number usually begins with 98, serves as your Known Traveler Number (KTN) and can be found on the back of your ID card, which you should receive once you are successfully enrolled in a Trusted Traveler Program, named above.
"You can verify this information by logging into GOES. Choose the “Change Profile” option to verify first/middle/last name/date of birth and PASSID, which is your KTN. Your trusted traveler card will not grant you access to TSA PreCheck; TSA PreCheck must be printed on your boarding pass in order to receive expedited screening benefits.
"Members of the TSA PreCheck Application Program (different than the Trusted Traveler application program, described above) have a KTN that starts with the letters TT. Please provide this number when booking a reservation on one of the participating airlines. You may obtain a KTN if you are enrolled in one of the four trusted traveler programs.
It is important to note that TSA PreCheck is not always guaranteed, even if you include the KTN/PASS ID. TSA incorporates random and unpredictable security measures throughout the airport. So while passengers enrolled in TSA PreCheck have been pre-cleared to access the TSA PreCheck lane, no passenger is ever guaranteed expedited screening.
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