Junkers K 37
 The Junkers S 36 was a twin-engine mail plane developed in Germany in the late 1920s that was further developed in Sweden as a multi-role military aircraft albeit unsuccessfully under the designation K 37. The design itself was a low-wing cantilever monoplane of largely conventional design featuring twin tails and fixed tailwheel undercarriage. Construction was metal throughout and skinned in typical Junkers fashion with corrugated duralumin.