Southwest Airlines has long argued that its unassigned seating policy is popular with passengers and facilitates speedier boarding. That means planes spend less time at the gate and more time in the air generating Southwest money. Over the years, the airline has tinkered with the no-system boarding system.

Southwest Airlines originally adopted its "open seating" policy as a core part of its low-cost business model to improve operational efficiency and decrease "turnaround time." By allowing passengers to choose their own seats, the airline incentivizes people to board quickly, as those who arrive at the gate early get the first pick of the cabin. This eliminates the bottleneck of passengers searching for specific row numbers, which historically allowed Southwest to keep its planes in the air longer each day. In late 2024 and through 2026, Southwest has actually begun a massive transition away from this iconic model toward assigned seating. This shift was driven by extensive customer research showing that 80% of travelers—and 86% of potential new customers—preferred knowing their seat in advance, especially on the longer flights that now make up much of Southwest’s expanded route map. While the classic "free-for-all" boarding is being phased out, it remains a legendary example of how a simple behavioral incentive can significantly impact airline logistics and profit margins.