Registering for an account on the United Airlines website or mobile app is the first step towards adding TSA PreCheck to your profile. After selecting Profile or Travel Documents, go to the "Account" section. Your TSA PreCheck number should be entered in a field marked "Known Traveler Number" or something similar. How Do You Add TSA PreCheck to United Airlines update your profile by saving the changes. Your boarding passes will always have the TSA PreCheck indicator on them when your TSA PreCheck number has been updated. This will happen automatically across all future tickets. At airports that participate, this will enable you to take advantage of quicker security processing.
