John Wren was a successful businessman from Melbourne, Australia. He invested in gold exploration in the Watut Valley, which was an area rich in gold. However, Wren's venture was not successful. The aerodrome would likely to have been the one cleared to support exploration and closed with the venture, G-AUHJ was operated by Airgold. It crashed at Bulolo, another hub of gold mining activity, on October 7, 1930 while still registered as G-AUHJ. Photo from: State Library of Victoria

Light parasol monoplane designed by Harvey and Wilson Doyle and built by Vulcan company of Portsmouth, Ohio, which made golf clubs. Name American Moth chosen to capitalise on popularity of DH Moth. Photo taken at National Air Races and shows Robert Dake (pilot, left) and Ted Taney (navigator) who were the crew for the American Moth during the 1928 transcontinental race. After eight examples, assets and rights taken over by Davis Aircraft, which produced the modified Davis V-3 and D-1, of which some 60 were built. The Doyle brothers left Vulcan to build the Doyle O-2 Oriole. Photo from: San Diego Air & Space Museum

'Unidentified people in front of Junkers K16 small plane.' Seating a pilot and two passengers, the K16 was actually intended as an airliner when first flown in 1921. 17 examples built. This Czechoslovak-registered aircraft, later changed to OK-ACA, was owned by Prince Ulrich Kinsky from 1928. He had his own airfield in Klešice, near Pardubice. Photo from: Narodowe Archiwum Cyfrowe