One of the most important aircraft in Australian aviation history, VH-UER was the first air ambulance. It graces the Australian $20 note along with a portrait of John Flynn, the founder of an air ambulance service in outback Queensland that evolved into the Royal Flying Doctor Service. -UER was sold in 1934 and wrecked when it ditched near Caloundra on December 8, 1935. Photo from: National Library of Australia

Built by Qantas as G-AUHE in 1928 and flew with the airline until it crashed near Winton, Queensland, on October 3, 1934. Photo from: State Library of Queensland

Later had a Bristol Jupitor radial fitted. Became VH-UEJ and was destroyed in a forced landing at Methul, NSW, on June 9, 1932. Hood Collection/State Library of New South Wales

Built by Qantas under licence from de Havilland. Reregistered VH-UHE by August 1930. Crashed near Winton, Queensland, October 3, 1934. Photo from: Hudson Fysh Collection/State Library of New South Wales

Qantas sold G-AUFW in 1931 by which time it was VH-UFW. Crashed at Capella, Queensland, on July 19, 1936. Qantas liked the DH.50 and built several some, like FW, with Siddeley Puma engines and others with Bristol Jupiter radials. Photo from: Hudson Fysh Collection/State Library of New South Wales