Nice prop blur and a nice catch for Mr Hahn, although he left the unique Fokker F.XX unidentified in the German archive. Note the removal of the aircraft's wheel doors in comparison with our earlier photo. Photo by: Walter Hahn / SLUB / Deutsche Fotothek

Speed or comfort? Announced together with the luxurious F.XXXVI (F.36) in December 1932, the F.XX (F.20) was the only prewar Fokker airliner with retractable landing gear. Like its big sister, it was not ordered in series by KLM which opted for the metal DC-2. The only example, KLM's Zilvermeeuw (herring gull) is best known for going tech on 18 December 1933, an F.XVIII, PH-AIP Pelikaan, making a hyped Christmas mail flight to the Netherlands East Indies instead. Despite carrying the legend Holland-Java on its belly, the F.XX served on European routes. It ended up with the Spanish airline LAPE and crashed at Barcelona - El Prat in February 1938. Photo from: Nederlands Instituut voor Militaire Historie