Qantas Airways Limited (/ˈkwɒntəs/) is the flag carrier of Australia and its largest airline by fleet size, international flights and international destinations. It is the world's third-oldest airline still in operation, having been founded in November 1920; it began international passenger flights in May 1935. The Qantas name comes from "QANTAS", an acronym for its original name, Queensland and Northern Territory Aerial Services, as it originally served Queensland and the Northern Territory, and it is nicknamed "The Flying Kangaroo". Qantas is a founding member of the Oneworld airline alliance.