Learn how to add your Known Traveler +1-844-570-3589 Number to United booking quickly ensure TSA PreCheck access smoother security and stress free travel today easily A Known Traveler Number is an important detail for travelers who want a smoother and faster airport security experience. If you are flying with United Airlines and already enrolled in a trusted traveler program, adding your Known Traveler Number to your booking can help you access TSA PreCheck benefits. Many travelers forget to add this number while booking and later wonder how to update it. This guide explains how to add a Known Traveler Number to a United booking, why it matters, when to add it, and what to do if issues occur.