The Aero A.23 was a Czechoslovakian airliner of the 1920s. Aero Vodochody had produced the first Czech airliner, the A.10, four of which had served with ČSA, the national airline. The A.23, another biplane, was bigger, more powerful, and could carry more passengers.
The Avia BH-21 was a fighter biplane designed and produced by the Czechoslovakian aircraft manufacturer Avia. First flown in January 1925, it served an important role in securing Czechoslovak national security during the Interwar period.
The Caproni Ca.97 was a utility monoplane aircraft designed and produced by the Italian aircraft manufacturer Caproni. It had a range of powerplant arrangements, the aircraft could be flown with many as three radial engines, however, many were build with only the nose engine present or with only the two nacelle-mounted engines.
The Hanriot H.43 was a military utility biplane designed and produced by the French aircraft manufacturer Hanriot. It was primarily used by the Aéronautique Militaire as a trainer aircraft during the interwar period.
The Avia 51 was a trimotor monoplane commercial transport. It was designed by Robert Nebesář and built by the Czechoslovakian aircraft manufacturer Avia. The type proved to be uneconomical in use and thus only three aircraft were ever built.
The Dyle et Bacalan DB-10 was a heavy night bomber, designed in France and flown in 1926. It was a twin engine, high wing, metal frame monoplane, distinguished by a very thick centre section wing which formed the forward fuselage and housed the engines.
The Pander E was the first indigenous Dutch training aircraft, used by clubs and also privately owned. A two-seat, single-engine biplane, 17 were built in the Netherlands from 1926 with engines of increasing power.
The Gribovsky G-25 was a Soviet tandem seat biplane basic trainer built in the late 1930s. It was hoped to minimize unit costs by using a modified automobile engine but the G-25 did not reach production.
The Albert TE.1 was a single seat cantilever parasol wing monoplane, wood framed and skinned and built in France in 1926. It made some notable long flights, set a French altitude record for its class and proved a practical light aircraft.
The Albessard Triavion, sometimes known as the Peyret-Albessard Triavion, was a three surface aircraft, combining a tandem wing and conventional tailplane.
The Les Mureaux 3 C.2 and Les Mureaux 4 C.2 were French two seat, parasol winged fighters, flown in 1927-8, which differed only in their engines. They were developed into near identical army co-operation types, the ANF Les Mureaux 130 A.2 and ANF Les Mureaux 131 A.2, in 1929–31.
The Avia 60-MP was a French motor glider with a wing based on that of the Avia 32-E, an advanced training glider. It was intended as both an advanced trainer and as an atmospheric research aircraft.
The Potez 51 was a 1930s French intermediate trainer, intended to replace the ageing Potez 25 which had sold worldwide. It did not go into production.
The Leduc RL-12 was a French low power, economical, parasol wing, single seat aircraft. First flown in July 1939, its development was halted by World War II.
The Silesia S-4 was a Polish, low-power parasol wing aircraft built in 1925. After an engine change and airframe modifications it became one of the Silesian Aeroclubs fleet. It was lost in a take-off accident in 1931 and was the last Silesia aircraft to fly.
The D.K.D.3 was a Polish, single seat, parasol-wing sports aircraft first flown in 1927. Only one was built but flew in demonstrations and in national competitions into the early 1930s.
The Sido S.1 was a Polish two seat, parasol wing trainer aircraft, first flown in 1930.
The Laird LC-B was a three seat, single-engined biplane, built for private owners in the U.S. in the late 1920s and offering a variety of engines. About 35 had been built before production ceased in the mid-1930s. Two have been restored to flight.
The Inland Sport series of parasol wing, sport and training side-by-side two seaters, introduced between 1928 and 1930, differed chiefly in their engines. They used three different radial engines, more than doubling the Sport's power over two years of development. 34 examples were built and frequently re-engined.
The Wallace Touroplane was a late 1920s U.S. three seat, high wing cabin monoplane. About 20 were built.
