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The de Havilland DH.27 Derby was a large single-engined biplane designed to a heavy day bomber Air Ministry specification. It did not reach production.
The Latécoère 6 was a French four-engined biplane bomber of the early 1920s. It was of advanced all-metal construction and probably the first aircraft to use geodetic construction. Only one was built.
The Junkers T 23 was a two-seat, single-engined experimental training aircraft, built in Germany in the early 1920s. It could be configured either as a parasol winged monoplane or as a biplane to compare handling characteristics. 4 were constructed.
The Albatros L.71 was a two-seat, single pusher engined biplane built in Germany in the 1920s.
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.67 was a simple single seat biplane with a low powered engine. It was built and flown in France in 1922.
The Heinkel HD 20 was a twin engine, three seat German biplane built in 1926 for civil survey work.
The Skraba S.T.3 was a two-seat Polish biplane built in 1928. It was the first all-metal aircraft designed in Poland; only one was completed.
The Simplex Red Arrow was a US single-engined monoplane produced in the late 1920s and early 1930s and intended as club machine or mail transport. Most used radial engines in the 90–110 hp (67–82 kW) range. They carried one or two passengers whose seats could be open or enclosed. One variant, the Red Arrow Dual Plane, was easily converted from monoplane to biplane and was available with two versions of the much more powerful Wright Whirlwind engines. In all about 20 were built.
The Southern Air Boss was a 1920s U.S. biplane trainer aircraft. One prototype was built and by 1929 a new factory was ready for its production but this did not follow.
The Itoh Emi 1 was Japan's second successful civil aircraft and the first design of Orojiro Itoh.
The Itoh Emi 3 was the first Japanese civil passenger carrying seaplane, flown in 1917 and used for commercial demonstrations and passenger flights.
The Itoh Tsurubane No.1 was a single seat aviation demonstrator and trainer biplane first flown in Japan in 1918.
The Itoh Emi 9 was a two-seat Japanese training biplane built in 1918.
The Itoh Emi 13 was a two seat Japanese trainer, designed for the Itoh flying school and introduced in two versions in 1920 and 1921.
The Itoh Emi 14 was a Japanese biplane designed in 1920 for a long distance competitive flight from Tokyo to Osaka and back, which it won. It was also successful at a contest later that summer, before suffering terminal structural failure during aerobatics a few weeks later.
The Itoh Emi 16 Fuji-go (Fuji), built in 1920, was intended as a cheap and simple general purpose civil biplane but gained publicity with exhibition flights and successful speed and altitude contests against higher-powered fighter aircraft.
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.
The Fukunaga Tenryu 10 was the largest Japanese civil passenger aircraft when it first flew in 1922. Its passenger cabin seated four.
The Huff-Daland HD.8A was a small civil transport biplane carrying two passengers built in the U.S. in 1922. The otherwise identical HD-9A offered an alternative engine.