Southwest Airlines is a major U.S. airline and the world's largest low-cost carrier. It is headquartered in Dallas, Texas.Southwest Airlines was established by Herb Kelleher in 1967 and adopted its current name in 1971. The airline has become known for its unique approach to business and customer service, with a focus on simplicity and efficiency.

As of my knowledge cutoff in September 2021, Southwest Airlines operates an all-Boeing 737 fleet, which helps the airline maintain simplicity in operations and maintenance.Southwest primarily serves destinations within the United States, but it has also expanded service to the Caribbean and Mexico. As of my last update, it serves more than 100 destinations.

One unique aspect of Southwest is that it doesn't assign seats. Instead, passengers are given a boarding group (A, B, or C) and position (1-60+) when they check in for their flight. At the gate, passengers line up in order of their boarding group and choose any available seat on the aircraft.

Southwest has an open seating policy, which means you can sit anywhere you like on the plane once you board. Passengers are assigned a boarding group and position when checking in for their flight and board the aircraft in that order.