G-AUBG prior to receiving its registration. It remained with QANTAS until November 1926 when it was sold. Became VH-UBG when Australia adopted that prefix in 1929 and was struck off the register in April 1932 after the CoA expired. The engine is a Sunbeam Dyak. RAAF 504K A3-4 was lent to Qantas in 1965, fitted with a Dyak and painted to represent G-AUBG. This aircraft was returned to the Australian War Memorial in 1987. It had been replaced by a replica of G-AUBG now displayed at the Qantas Founders Museum at Longreach. Photo from: National Library of Australia

Later VH-UCZ. Crashed Somerton, Victoria, June 9, 1930. Photo from: Powerhouse Museum

The first of six 504Ks built in Sydney and test flown from the airfield at Mascot (now Sydney International). A3-48 crashed on September 29, 1927. Photo from: National Library of Australia

Beaches were handy areas of flat firm ground at a time when aerodromes were scarce. Initially G-EAIY (registered August, 1919) and shipped to Australia for assembly by Australian Aircraft and Engineering Co. It became G-AUBE in June 1921 and struck off in June 1923. Returned as G-AUEO in October 1928 with a Sunbeam Dyak engine in place of the original Clerget. Crashed in February 1929 and struck off the register a year later. Repaired and flew again in January 1932 (crashed soon after) but not formally registered after March 1930. Photo from: State Library of Queensland

Built at Mascot, Sydney. Flown from a nearby cow paddock that is today's Sydney International Airport. G-AUDR registered in 1922, the year AAEC went bust. It had been formed three years earlier to make 504Ks. -UDR initially fitted with a Sunbeam Dyak engine but in the photo has a more powerful Curtiss K6. The distinctive 504 rudder has been replaced with a fin and rudder resembling that of an Avro Avian. Avro wrecked in a gale at Moora Valley c1926. Photo from: State Library of Queensland