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 Curtiss-Wright AT-9 Jeep was a twin-engined advanced trainer aircraft used by the United States during World War II to bridge the gap between single-engined trainers and twin-engined combat aircraft. The AT-9 had a low-wing cantilever monoplane configuration, retractable landing gear and was powered by two Lycoming R-680-9 radial engines.
The ANBO V was a parasol wing monoplane training aircraft designed for the Lithuanian Army in 1931. A developed version, the ANBO 51 followed in 1938.
The Lublin R-X was a Polish single-engined, two seat liaison aircraft, built in 1929 in the Plage i Laśkiewicz factory in Lublin. Seven were completed, two of them prototypes. Four served with Polish air regiments and another made several notable long flights and tours.
The Letov Š-20 was a fighter aircraft produced in Czechoslovakia during the 1920s.
The Arado Ar 77 was a German twin-engined monoplane, designed as an advanced training aircraft from 1934.
The Mercury Chic T-2 was a lightweight American parasol wing monoplane designed and built by the Mercury Aircraft Inc. in the late 1920s. Flown for the first time in 1928, about 27 were built, but due to the early 1930s economic depression only 15 were sold, and the rest were scrapped.
The Rolandas Kalinauskas RK-5 Ruth, also called the Viltis, is a Lithuanian light aircraft, designed and produced by Rolandas Kalinauskas, of Prienai. The aircraft is supplied as a complete ready-to-fly-aircraft.
The Villiers 31 or Villiers 310 was a French eight passenger airliner of advanced construction. Owing to Villiers' financial failure, it was not developed.
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 Lambert Twin Monocoach was a light, twin-engined U.S. aircraft, designed to carry three or four passengers. Initially it was fitted with economical, low-powered engines but even given a large increase of power it failed to attract customers.
The Hockaday Comet was a two-seat light civil aircraft, built in the United States before World War II but not flown until near the war's end. It failed to attract buyers and only one was completed.
The Kellner-Béchereau 23 was a French two seat cabin touring aircraft, built in 1932. Its wing was constructed in a novel way. Only one was completed.
The Curtiss-Reid Courier was designed in Canada in 1931 as a specialist, non-passenger carrying, mailplane capable of maintaining services in Canada's hard winters. The 1930s depression led to the end of government subsidised airmail contracts and only one prototype flew. It was lost in 1933 during preparations for a private, long distance flight.
The Bodiansky 20, a French four-seat touring aircraft flown in the early 1930s, was one of the first French aircraft to adopt Handley Page slots to delay the stall and lower landing speed.
The SABCA Demonty-Poncelet monoplane, Demonty-Poncelet limousine or SABCA-DP was a Belgian light aircraft first flown in 1924. It had two comfortable side-by side seats in a glazed cabin. Though it had competition successes in 1924 and 1925, it did not go into production.
The Bréguet 25 or XXV was a French two seat fighter from 1925. It was heavily armed, carrying seven machine guns.
TheYakovlev AIR-9 / AIR-9bis was a 2-seat sport aircraft designed and built in the USSR during the early 1930s.
The Raab-Katzenstein RK.9 Grasmücke (Hedge-sparrow) was a 1920s German two-seat touring, advertising and training biplane. It was one of many designs from several countries aiming to provide low cost flying and was quite successful, with about twenty built.
