Questions about Southwest Airlines (IATA code WN), the largest low-cost carrier based in the United States, and its largest domestic carrier.

Southwest Airlines is a low-cost carrier based in , , and a major US airline.

Southwest exclusively flies Boeing 737 jets, mostly on medium- and short-haul point-to-point routes. It has expanded from its humble origins as an intra-Texas carrier to become, by various measures, the largest domestic carrier in the US, the largest low-cost carrier in the world, the largest US airline by market value. In 2010 it acquired low-cost carrier AirTran Airways, which ceased operating at the end of 2014.

  • Hub airports: none, but with major operations at Thurgood Marshall Baltimore–Washington International Airport (), Chicago Midway International Airport (), Dallas Love Field (), Denver International Airport (), Hartsfield-Jackson Atlanta International Airport (), Houston Hobby Airport (), Las Vegas McCarran International Airport (), Los Angeles International Airport (), Nashville International Airport (), Oakland International Airport (), Orlando International Airport (), and Phoenix Sky Harbor International Airport () among others.
  • Airline alliance: none
  • Loyalty program: Rapid Rewards
  • Lounge/club: none
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