Morane-Saulnier MS.406
The Morane-Saulnier M.S.406 was a French single-seat fighter, the production development of the M.S.405 prototype that first flew on 8 August 1935, built to a 1934 French Air Force requirement. It was France's most numerous fighter of the Second World War: 1,037 were completed in France before the collapse of June 1940, with limited production continuing under German supervision afterwards, and Wikipedia's accounting puts the French-built total at 1,176. Outmatched by the Messerschmitt Bf 109E in speed, armour and armament, though able to out-turn it, French squadrons flying it were credited with 269 confirmed victories, against 696 confirmed victories for French single-engined fighters as a whole in 1940. After the armistice it fought on with Vichy forces in Syria, Madagascar and Indochina; Finland flew it in the Winter and Continuation Wars and re-engined 41 aircraft with captured Soviet engines as the Mörkö-Morane; and Switzerland built it under licence as the D-3800 and developed the D-3801, which served until 1959. The examples preserved today are Swiss D-3801s.