How to add known traveler number to delta?
To add your KTN to Delta, you can do so through their website or mobile app. Once you have signed in to your account, click on your name or profile icon and select "Profile" or "Edit Profile". Under "Personal Details", enter your KTN in the "Secure Flight Passenger Data" section and click "Save".
If you are already at the airport, you can also add your KTN at the airline check-in counter.