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Frontier Airlines TSA Precheck As a participant in TSA PreCheck, Frontier Airlines offers qualified travelers quicker security screening at American airports. Travelers can use designated lanes and bypass taking off their shoes, belts, laptops, and liquids during the security check process by utilizing TSA PreCheck. Passengers should submit their Known Traveler Number (KTN) when booking or add it to their reservation later in order to utilize this service when flying with Frontier. For passengers flying with Frontier Airlines, TSA PreCheck helps expedite the airport experience by making it quicker and more convenient.