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The Koolhoven F.K.42 was a parasol-wing, two-seat training monoplane manufactured by Koolhoven in the Netherlands. Only one was built.
The NAVO RK-4/220 was a Dutch aircraft originally designed for unofficial crowd observation but which was completed as an airliner. Only one was built; it flew, but was never certified.
The Stahlwerk-Mark R.V, sometimes known as the Stahlwerk-Mark R.V/23 to indicate its year of production, was a small German airliner able to carry three passengers. Two were built.
The Potez 35 was a twin engine bomber aircraft, designed and built in France in the late 1920s. Only one was completed.
The Potez 38 was a French single engine, eight or nine seat passenger aircraft flown in 1930. Only one was built.
The Caudron C.74 was a ten-seat, four engine passenger biplane built in France in 1922. It showed promise but the sole prototype crashed fatally in a competition and no more were completed.
The Caudron C.33 "Landaulet Monsieur-Madame" was a French twin engined biplane with four seats, two in open cockpits and two in an enclosed cabin.
The Heinkel HD 20 was a twin engine, three seat German biplane built in 1926 for civil survey work.
The Renard R.33 was a Belgian training aircraft with aerobatic capability. Two were flown in 1934 but no more were produced.
The Morane-Saulnier MS.350 was a French aerobatic trainer flown in 1936. Only one was built but it had a long career, flying post-war until the 1960s.
The Albatros L 83 Adler was a small, fast transport aircraft for passengers, mail or other cargo, flown in Germany in 1931. Two were built.
The Aerial Engineering Corporation Standard 6W-3 was a commercial transport modification of the US Standard J-1 biplane military trainer aircraft, with new wings, engine and accommodation for four passengers. First flown in 1925, it was built in small numbers.
The Zeppelin-Lindau Gs.I, often known post-WWI as the Dornier Gs.I after its designer Claude Dornier, was a civil flying boat developed immediate post-war from a military prototype. Its passenger cabin seated six. Only one was completed, and that was eventually scuttled to keep it out of Allied hands. Another of the military prototypes was intended to have a bigger, nine seat cabin and other refinements but the Gs.II was incomplete when discovered by Allied inspectors.
The Ireland Privateer was an American, 1930s, two-seat, single pusher-engined sports flying boat which could be equipped as an amphibian. About 18 were built.
The Ogden Osprey was a three engine, high wing monoplane airliner which seated six. Designed in the United States and first flown in the spring of 1930 or earlier, six were built and some used commercially before Ogden Aeronautical ceased trading in the Great Depression.
The Day A Special, named Errant, was designed in the U.S. by Charles Healey Day, as a safe, easy to fly tourer, for two sitting side-by-side. In 1931 the designer and his wife flew Errant on a seven month world tour.
The Wiley Post Model A is a U.S. two seat sports biplane, built in small numbers in the 1930s.
The Tachikawa KKY, full name Tachikawa Army Small and Light Ambulance Aircraft was designed to rescue injured or sick patients from places without established airfields. Following two earlier prototypes, 21 production examples were built between 1936 and 1940 and served in the Second Sino-Japanese War.
The Kawanishi K-6 was a passenger-carrying biplane floatplane, built in Japan in the 1920s. The sole example took part in an around Japan flight then flew as a transport with Japan Aviation.
The Itoh Emi 29 Taihoku-go was a 1920s Japanese civil transport with its two passengers in a enclosed cabin. It was the first of this "limousine" type to be built in Japan; the only example flew the Osaka-Tokyo route for a while.