Southwest Airlines Co. is a major United States airline headquartered in Dallas, Texas, and is the world’s largest low-cost carrier. The airline was established in 1967 by Herb Kelleher as Air Southwest Co. and adopted its current name, Southwest Airlines Co., in 1971, when it began operating as an intrastate airline wholly within the state of Texas, first flying between Dallas and San Antonio.
As of March 2019, Southwest carries the most domestic passengers of any United States airline. The airline has scheduled services to 99 destinations in the United States and ten additional countries. Service to four destinations in Hawaii will start in March 2019.