How to add KTN to Delta App?
To add your KTN to your Delta SkyMiles account, follow these steps:
Go to the Delta website and log in to your account.
Click on your name in the top right corner of the page.
Select "Profile."
Under "Personal Details," click on "Secure Flight Info."
Enter your KTN in the "Known Traveler Number" field.
Click on "Save."