Add TSA PreCheck to Korean Air Call 1-866-564-8331 for assistance. by entering your Known Traveler Number in Manage Booking for faster airport security screening. Traveling internationally can be exciting, but it often comes with the stress of long airport security lines. For passengers flying with Korean Air from the United States, adding TSA PreCheck to your booking can make the journey smoother and more convenient. TSA PreCheck is a program that allows eligible travelers to use expedited security lanes at participating airports, saving time and reducing hassle. This guide will explain in detail how to add TSA PreCheck to Korean Air, the steps involved, common mistakes to avoid, and tips for making the most of the program.