most of the people want to know about  how to add tsa precheck to delta app ? For the Delta Airlines app to support TSA PreCheck: Verify your TSA PreCheck eligibility by checking your eligibility. Citizens of the United States, permanent residents, and some foreign visitors are eligible. Apply online at the TSA PreCheck application page to become a TSA PreCheck member. Fill out the application, pay the price, and arrange a personal appointment for verification at an enrollment centre. Attend the appointment: Show up on time, bring the necessary paperwork, and submit to a background check and fingerprints. You will be given a Known Traveller Number (KTN) once your application has been approved. Launch the Delta Airlines app on your device to access it. Log in: If necessary, create an account or log into your Delta account.