Southwest Airlines Co. (NYSE: LUV) is a major U.S. airline and the world's largest low-cost carrier, headquartered in Dallas, Texas. The airline was established in 1967 and adopted its current name in 1971. The airline has nearly 46,000 employees as of December 2014 and operates more than 3,400 flights per day. As of June 5, 2011, it carries the most domestic passengers of any U.S. airline. As of November 2014, Southwest Airlines has scheduled service to 93 destinations in 41 states, Puerto Rico and abroad.
Southwest Airlines has used only Boeing 737s, except for several years in the 1970s and 1980s, when it leased some Boeing 727s from Braniff. As of August 2012, Southwest is the largest operator of the 737 worldwide with over 650 in service, each averaging six flights per day.