Junkers Ju-186 high-altitude

The Junkers Ju 186 was a proposed four-engine, high-altitude version of the Junkers Ju 86. It never progressed beyond the prototype stage and was not built. The Ju 186 was part of a series of Junkers aircraft, including the Ju 86, Ju 88, and Ju 52. The Ju 86 was a twin-engine aircraft designed for both high-speed airliners and bombers, while the Ju 88 became a key aircraft for the Luftwaffe during World War II.