Delta Air Lines, Inc. provides scheduled air transportation for passengers and cargo in the United States and internationally. The company operates through two segments, Airline and Refinery. Its route network is centered on a system of hubs and markets at airports in Amsterdam, Atlanta, Boston, Detroit, London-Heathrow, Los Angeles, Mexico City, Minneapolis-St. Paul, New York-LaGuardia, New York-JFK, Paris-Charles de Gaulle, Salt Lake City, São Paulo, Seattle, Seoul-Incheon, and Tokyo-Narita. The company sells its tickets through various distribution channels, including delta.com and mobile applications/Web, telephone reservations, online travel agencies, traditional brick and mortar, and other agencies. It also provides aircraft maintenance, repair, and overhaul services; and vacation packages to third-party consumers, as well as aircraft charters, and management and programs. The company operates through a fleet of approximately 800 aircraft. Delta Air Lines, Inc. was founded in 1924 and is headquartered in Atlanta, Georgia.