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ANSWER: Your TSA PreCheck number is ***** known as your Known Traveler Number. So if you are making your reservations online, you put that number in your Known Traveler Number (KTN) space and it will be in your reservation. If you make your reservation by phone, then you need to tell the customer service agent that you want to add it to your reservation. If you've already made the reservation, then call the airline and ask them to add it to your reservation.
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