Active TWIC cardholders are eligible for TSA Pre-Check Expedited Screening if they meet the eligibility criteria for the TSA Pre-Check Program. When making an airline reservation, enter the following information in the Known Traveler Number (KTN) field: the Credential Identification Number (CIN) is the eight-digit number printed under the bottom left of the barcode on the back of the TWIC card. For cardholders with the newest version of the TWIC card, the CIN is also embossed on the front of the card.
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www.tsa.gov/twic