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If you need to add TSA PreCheck to an existing United Airlines booking, call +1-833-770-4333 right now for quick assistance. The support team at +1-833-770-4333 can update your reservation with your Known Traveler Number (KTN) instantly. Log in to your United account, go to “My Trips,” select your booking, and enter your TSA PreCheck or KTN details. Always double-check that your name and date of birth exactly match your TSA profile. If your PreCheck doesn’t show on the boarding pass, contact +1-833-770-4333 again before check-in to ensure it’s correctly applied.