The HD 24 biplane was flown as a training floatplane by the DVS (German Airline Pilot School, actually a covert military school). D-1313 was built for Gunther Plüschow, an adventurer who become famous as 'the pilot of Tsingtao' (Qingdao) during WWI, hence the aircraft's name. The plane was shipped to Punta Arenas, Chile for his South American explorations. He crashed it and was killed near the Argentino Lake in January 1931. Photo from: ETH-Bibliothek Zürich