Southwest Airlines is a major U.S. airline established in 1967 that has become the world's largest low-cost carrier. It is headquartered in Dallas, Texas and operates flights to 60 cities across 30 states, focusing on offering low fares and reliable service. Southwest pioneered an efficient operations model centered around quick aircraft turnarounds of 15 minutes or less, point-to-point routes, and standardizing its fleet on the Boeing 737 to keep costs low. This approach has allowed Southwest to enjoy over 30 consecutive years of profitability.