Hello, I'm Bruno, and a popular question is How Do You Add TSA PreCheck to United Airlines? It is an easy and fast way to speed up airport security. Enter your Known Traveler Number into your United MileagePlus profile when you have received it from the TSA. Additionally, whether making a new reservation or modifying an existing one, you can enter a flight manually. TSA PreCheck speeds up the screening process for qualifying passengers without having them remove their computers, belts, or shoes. By checking your PreCheck status, United provides an easy travel experience, saving time and bypassing queue waiting. Visit us:......See More