Hi, I am Bruno, and the question that people usually ask is How Do You Add TSA PreCheck to United Airlines? » It is a convenient and simple way to accelerate airport security. After you have received your Known Traveler Number from the TSA, put it in your United MileagePlus profile. You can also enter a flight manually while reserving or changing an existing reservation. For eligible travelers, TSA PreCheck expedites the screening process without requiring them to remove laptops, belts, or shoes. United ensures a hassle-free travel experience by recognizing your PreCheck status, saving you time and avoiding you from waiting in lines.