How to add TSA pre to Delta?

Here are the steps on how to add TSA PreCheck to Delta:

1. Go to the Delta website: Flights & Plane Tickets + Hotels & Rental Cars and sign in to your account.
2. Click on the "Profile" tab.
3. Under "Personal Details", enter your TSA PreCheck Known Traveler Number (KTN) in the "TSA PreCheck/Known Traveler ID" field.
4. Click on the "Save" button.

Your TSA PreCheck number will be added to your Delta profile and will be displayed on your boarding pass when you fly Delta.