To add Global Entry to your Delta flight in 2026, you must input your 9-digit PASS ID (found on the back of your Global Entry card) into the "Known Traveler Number" (KTN) field. You can do this by logging into your Delta SkyMiles profile on the website or app, navigating to "Personal Details," and saving the number under "Secure Flight Passenger Data." This ensures it is automatically added to future bookings. For an existing reservation, go to "My Trips," select "Edit Passenger Info," and enter the KTN there. It is crucial to ensure the name on your Delta ticket matches the name on your Global Entry card exactly. Once added correctly, your boarding pass should display the "TSA PRE" logo, allowing you to use expedited security lines in the U.S. and the Global Entry kiosks when returning to the U.S. from international destinations.