Southwest Airlines STL Terminal is a major American airline headquartered in Dallas, Texas. Established in 1967, it is known for its low-cost, no-frills approach to air travel and is one of the largest domestic carriers in the United States. The airline operates a fleet primarily consisting of Boeing 737 aircraft and serves over 100 destinations across the U.S., Mexico, and the Caribbean. Southwest is known for its customer service, free checked bags, and flexible policies, including no change fees. With a focus on simplicity and affordability, Southwest remains a popular choice for travelers seeking reliable and budget-friendly flights.