Southwest Airlines Co. (nyse: LUV) is an American low-cost airline based in Dallas, Texas, with its largest focus city at Las Vegas' McCarran International Airport. It is the largest airline in the United States by number of passengers carried domestically per year and (as of December 31, 2007) also the largest airline in the world by number of passengers carried. It is also the 6th largest U.S. airline by revenue. It also maintains the fifth-largest passenger fleet of aircraft among all of the world's commercial airlines. As of July 12, 2008, Southwest operates approximately 3,500 flights daily.

Southwest Airlines has carried more customers than any other U.S. airline since August 2006 for combined domestic and international passengers according to the U.S. Department of Transportation's Bureau of Transportation Statistics. Southwest Airlines is one of the world's most profitable airlines, posting a profit for the 35th consecutive year in January 2008.

History

Southwest Airlines was originally incorporated to serve three cities in Texas as Air Southwest on March 15, 1967, by Rollin King and Herb Kelleher. According to frequently-cited story, King described the concept to Kelleher over dinner by drawing on a paper napkin a triangle symbolizing the routes.(Dallas, Houston, San Antonio)

Some of the incumbent airlines of the time (Braniff, Trans-Texas, and Continental Airlines) initiated legal action, and thus began a three-year legal battle to keep Air Southwest on the ground. Air Southwest eventually prevailed in the Texas Supreme Court, which ultimately upheld Air Southwest's right to fly in Texas. The decision became final on December 7, 1970, when the U.S. Supreme Court declined to review the case without comment. That date is considered by many to be the de facto beginning of deregulation in the airline industry.

The story of Southwest's legal fight was turned into a children's book, Gumwrappers and Goggles by Winifred Barnum in 1983. In the story, TJ Love, a small jet, is taken to court by two larger jets to keep him from their hangar, and then to try and stop him from flying at all. Taken to court, TJ Love's right to fly is upheld after an impassioned plea from The Lawyer. While no company names are mentioned in the book, TJ Love's colors are those of Southwest Airlines, and the two other jets are colored in Braniff and Continental's colors. The Lawyer is designed to resemble Herb Kelleher. The book was adapted into a stage musical, Show your Spirit, sponsored by Southwest Airlines, and played only in towns serviced by the airline.

Southwest Airlines founder Herb Kelleher studied California-based Pacific Southwest Airlines extensively and used many of the airline's ideas to form the corporate culture at Southwest, and even on early flights used the same "Long Legs And Short Nights" theme for stewardesses on board typical Southwest Airlines flights.