Qantas is Australia's flag carrier airline, nicknamed "The Flying Kangaroo". It is the oldest continuously operated airline in the world and has its main hubs in Sydney, Melbourne, and Brisbane airports. Qantas was founded in 1920 as Queensland and Northern Territory Aerial Services and has grown to become the largest airline in Australia with a 65% share of the domestic market. The company headquarters is located in Sydney and it operates various subsidiary airlines both domestically and internationally through codeshare agreements with other airlines.