To add TSA PreCheck to Ethiopian Airlines , contact their customer service at 1-866-564-8331 or update your profile online. Traveling internationally can be stressful, especially when departing from airports in the United States where security lines are often long and time-consuming. For passengers flying with Ethiopian Airlines, the flag carrier of Ethiopia, adding TSA PreCheck to your booking can make the journey smoother and more efficient. TSA PreCheck is a program offered by the Transportation Security Administration in the United States that allows eligible travelers to use expedited security lanes. This guide will explain in detail how to add TSA PreCheck to your Ethiopian Airlines booking, what requirements you need to meet, and how to ensure that your Known Traveler Number is correctly applied to your reservation.