Add TSA PreCheck to your Delta Airlines flight calling 1-866-284-2457 for assistance or by entering your KTN online. To add TSA PreCheck to your Delta Airlines flight, log in to your Delta account and go to the “My Trips” or “Profile” section. Enter your Known Traveler Number (KTN) under passenger details to ensure it's included in your booking. Your full name must exactly match your TSA PreCheck enrollment. If you’ve already booked your flight, you can still update this information by editing your reservation or calling Delta customer service. Once successfully added, the TSA PreCheck indicator will appear on your boarding pass, allowing you to access expedited security screening at participating U.S. airports.