Delta is one of the major legacy carriers of the US, headquartered in Atlanta, Georgia. The airline was founded in 1925 as Huff Daland Dusters in Macon, Georgia. It has nine hubs, Atlanta being the busiest and the largest in terms of the number of Delta passengers and departures. It covers 325 major cities of 52 countries in six continents, making it one of the world's most popular airlines. Delta has a fleet 919 aircraft, mostly Manufactured by Airbus and Boeing. It is the largest operator of Boeing 717, Boeing 757, and Boeing 767 in the world.