The Koolhoven F.K.58 was a single engine, interceptor-fighter aircraft designed and mainly manufactured by N V Koolhoven in the Netherlands under contract by France. Intended for Armée de l'Air use, the F.K.58 saw limited service in the Battle of France.
The Armstrong Whitworth F.K.3 was a British two-seat general-purpose biplane built by Armstrong Whitworth Aircraft during the First World War. By the end of the war it was considered obsolete for combat.
Koolhoven F.K.52 was a Dutch-designed, two-seat reconnaissance-fighter biplane, which was developed in the 1930s by Koolhoven. The aircraft was equipped with an enclosed cockpit and single-strut landing gear. Only six aircraft were produced. The aircraft saw some service in the Finnish Air Force.
NVI F.K.31 was a Dutch designed parasol wing two seat reconnaissance-fighter, which was developed in the 1920s by Frederick Koolhoven. The aircraft saw some service in the Finnish Air Force.
The Armstrong Whitworth F.K.10 was a British two-seat quadruplane fighter aircraft built by Armstrong Whitworth during the First World War. While it was ordered in small numbers for the Royal Flying Corps and Royal Naval Air Service, it was not used operationally. It is one of the few quadruplane aircraft to reach production.
The BAT F.K.23 Bantam was a British single-seat fighter biplane produced by British Aerial Transport Company Limited of London during World War I.
The BAT F.K.24 Baboon was a British two-seat training biplane produced by British Aerial Transport Company Limited of London during World War I.
The BAT F.K.26 was a British single-engined four-passenger biplane transport aircraft produced by British Aerial Transport Company Limited of London at the end of World War I.
The Koolhoven F.K.51 was a 1930s Dutch two-seat basic training biplane built by the Koolhoven Company.
The Koolhoven F.K.50 was a 1930s Dutch eight-passenger light transport monoplane designed and built by Koolhoven.
The Koolhoven F.K.42 was a parasol-wing, two-seat training monoplane manufactured by Koolhoven in the Netherlands. Only one was built.
The NVI F.K.33 was an airliner built in the Netherlands in 1925 for use by KLM for night flying.
The Koolhoven F.K.48 was an airliner built in the Netherlands in 1934 for KLM.
The Koolhoven F.K.49 was a photographic survey aircraft built in the Netherlands in 1935.
The Koolhoven F.K.55 was a Dutch fighter prototype of the 1930s, which did not progress beyond the prototype stage.
The BAT F.K.25 Basilisk was a prototype British fighter aircraft of the First World War. A single engined biplane intended to meet a requirement to replace the Sopwith Snipe, the Basilisk was unsuccessful, only three being built.
The Koolhoven F.K.56 was a 1930s Dutch basic training monoplane designed and built by Koolhoven.
The Koolhoven F.K.57 was a twin-engined, gull-winged monoplane built in the Netherlands as a personal transport for the Director General of Royal Dutch Shell. Only one was made, flying chiefly in Europe in the year before World War II, but destroyed when Germany invaded the Netherlands in May 1940.
The BAT F.K.27 was a two-seater sporting biplane designed by Frederick Koolhoven and built by the British Aerial Transport Company Limited (BAT) in 1918.
The NVI F.K.35 or Koolhoven F.K.35 was a two-seat fighter aircraft built in the Netherlands during 1926. It was completed and exhibited but, through a combination of ground accident and financial problems, never flown.
