Airlines established in 1920

Qantas Airways Limited ( ), doing business as QANTAS or Qantas, is the flag carrier of Australia, and the largest airline by fleet size, international flights, and international destinations in Oceania. A founding member of the Oneworld airline alliance, it is the only airline in the world that flies to all seven continents, with it operating flights to Africa, Antarctica, Asia, Europe, North America, and South America from its hubs in Sydney, Perth, Melbourne, and Brisbane. It also flies to over 60 domestic destinations across Australia.

regional airline based in Christchurch, New Zealand

CFRNA ("The French-Romanian Company for Air Transport"; ; ) was a French–Romanian airline, founded on 1 January 1920. Its name changed on 1 January 1925 to CIDNA ("The International Air Navigation Company"; ).

Defunct UK airline, 1919–1924