Frontier Airlines TSA Precheck As a participant in TSA PreCheck, Frontier Airlines enables qualified travelers to get through security checks at American airports more quickly. Travelers who use TSA PreCheck have access to designated lanes where they can retain laptops and liquids in their carry-ons and are not required to take off their shoes, belts, or light coats. Passengers must either add their Known Traveler Number (KTN) to their reservation at the time of booking or add it later in order
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