The venerable JU-52 had a long service life. Using Pratt and Whitney (American) designed engines it performed many duties as a transport, airliner, medivac, and even a bomber. One of the iconic aircraft in aviation history. Serving from the 1920's until the 1980's. Ford's equally as famous Tri-motor copied some design ques from it and he lost in court when sued by Junkers - TWICE! Interesting 10 minute read on the aircraft's history and various roles in the link below.
Can you name the American Transport Aircraft that was designed in the 1930's and is still in service today? If you said DC-3 you're right. Almost a hundred years in service.
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Iconic aircraft indeed. Ugly but robust.
LOL, utilitarian at it's utmost!