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 ANBO III was a parasol-wing monoplane training and utility aircraft designed for the Lithuanian Army in 1929. It became the first aircraft of Lithuanian design to be built in series, with two batches of four aircraft produced in 1930 and 1931. The ANBO IIIs also saw service as reconnaissance machines.
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 1936 and 1938.
The Avia BH-11 was a two-seat monoplane sport aircraft designed and produced by the Czechoslovakian aircraft manufacturer Avia.
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 Stearman M-2 Speedmail was a mail-carrier aircraft produced by the Stearman Aircraft Company of Wichita, Kansas. It first flew in January 1929. The Speedmail was a single-seat biplane, with two large cargo compartments in place of a front cockpit. The fuselage and tail unit were constructed from welded chrome-moly steel tube faired with wooden formers and fabric covered aft of the pilot's cockpit, and detachable aluminium alloy panels covered the fuselage forward of the cockpit. The wings were constructed from spruce spars and plywood built-up ribs, all fabric covered. It differed from previous Stearman aircraft by having a tailwheel instead of a tailskid due to its size and weight.
The Arado Ar 77 was a German twin-engined monoplane, designed as an advanced training aircraft from 1934.
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 Bounsall Super Prospector is an American STOL homebuilt aircraft that was designed and produced by Bounsall Aircraft of Mesquite, Nevada, introduced in 1990s. When it was available the aircraft was supplied as a kit or in the form of plans for amateur construction.
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 Caudron C.860 was a single engine, single seat monoplane ordered by the French government as a long distance communications aircraft. First flown in 1938, it was also expected to set speed and altitude records but the outbreak of World War II ended developments.
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 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.
The Raab-Katzenstein RK.25 was a two-seat, low wing cantilever monoplane aircraft designed and built in Germany in the 1920s for fast touring. Three were built and one had some success in a 1928 international contest. Another was later re-engined and provided with cabin accommodation.
The Działowski D.K.D.1 was the first powered aircraft designed by Stanislaw Działowski. It was a low-power high-wing monoplane with a cabin for one passenger. After attending an aviation exhibition in Warsaw in 1927 it was badly damaged when the engine failed as it left and it did not fly again.
