Southwest Airlines is a leading American low-cost carrier founded in 1967 and headquartered in Dallas, Texas. The airline is known for its point-to-point route network, no-frills service, and free checked baggage policy. It primarily serves domestic destinations with some international routes to Mexico, Central America, and the Caribbean. Southwest has built a reputation for operational efficiency and customer-friendly policies, making it one of the largest airlines in the United States by passenger volume.