The second FK.43, ordered by KLM and evaluated by the airline as an air taxi between April 1933 and 26 May 1933 when it crashed at Eelde, flown by two trainee pilots. The aircraft was not to blame and eight more FK.43s were delivered to KLM between 1933 and 1938. Photo from: Stadsarchief Rotterdam

Crop of overview photo 562611. Three FK.43s can be seen. PH-NAL and PH-NAK (far right) were built after the war by Fokker. PH-NAU (on left) is a 1938 original (c/n 4311), ex PH-ASN, which was flown to England on 14 May 1940. Behind it a Fokker S.9, again built post-war, Miles Gemini G-AKHJ and Fokker F.25 prototype PH-NBA. The two Swiss Fairchild 24s are HB-EAN and HB-EIK. G-AGVN is an Auster J-1 Autocrat. To the right are four planes of the Nationale Luchtvaart School: Tiger Moths PH-UCA and PH-UCD and Piper Cubs PH-UCT and PH-UCE. Photo by: Anton Snikkers / Nationaal Archief (Netherlands)

Frits Diepen's company ordered eight new Koolhoven FK.43 air taxis from Fokker after WWII. The design dated back to 1930. Diepen's air charter company became Aero Holland in January 1948. Photo from: Nationaal Archief (Netherlands)

One of the FK.43 air taxis used by KLM, Citroenvlinder crashed on a training flight in December 1937. Photo from: Amsterdam City Archives

First flown in 1931, the four-seat FK.43 executive aircraft and air taxi was one of the more succesful Koolhoven types, with a dozen examples built plus another eight by Fokker after WWII. Nine of the original aircraft were used by KLM. This one was delivered to the airline in November 1933 and named Juffertje (damselfly). It crashed at Amsterdam on 18 December 1935. Photo from: ETH-Bibliothek Zürich