Junkers setbacks with crashes of prototypes in 1937 and 1938. Further refinements enabled certification in 1939 and spurred South African Airways to make an initial order for two aircraft fitted with US-built Pratt & Whitney engines. Just as the aircraft was being readied for its first commercial flights, World War II began. With the outbreak of hostilities, all models were requisitioned by the Luftwaffe for military air-transport roles, and later, long-range maritime patrol. Military aircraft production was begun by the company in the 1930s and eventually monopolized all its resources. Perhaps the most notable design was the Junkers Ju 87 "Stuka"
Junkers EF 128 in World War II only models had been built. It had swept wings which included wood in their construction. There was a projected variant of a two-seater all-weather/night fighter with a lengthened fuselage. Junkers EF 128 The Junkers EF 128 was a high-altitude jet fighter designed by Junkers for the Emergency Fighter Program Luftwaffe design competition during the Second World War. This fighter would be powered by a Heinkel HeS 011 turbojet and armed with four MK 108 cannons, reaching a speed of 1000 km/h at an altitude of 7000 m. The production in series was projected to start around