As of early 2026, Southwest Airlines is often cited as having one of the fastest boarding processes, though it has recently transitioned from its iconic "open seating" to a standard assigned seating model. By using a "zone-based" boarding system that prioritizes its frequent flyers and those who pay for early access, Southwest aims to maintain its legendary turn-around times. However, mathematically, the "Steffen Method" (boarding window-middle-aisle from back to front) is the world's fastest, but it is rarely used by major airlines because it splits up families. Among traditional carriers in 2026, United Airlines has seen significant speed improvements by implementing its "WILMA" (Window-Middle-Aisle) boarding for economy passengers, which reduces the "aisle clog" caused by people climbing over each other. For 2026 travelers, the "fastest" experience is usually found on airlines that strictly enforce carry-on size limits, as most boarding delays are caused by passengers struggling to find overhead bin space.