♥  Only 199 Trimotors were ever built. Today, just 8 remain airworthy. Yet this quirky aircraft, with its externally mounted engine gauges which pilots could only check by looking out of the window left unique marks in history. In 1929, the Trimotor was the first plane to fly over the South Pole. And in 1932 Franklin Roosevelt flew in one during his 1932 presidential campaign, in one of first uses of aircraft in an election. The design principle of a corrugated sheet covering under a continuous, large and massive wing was a development from Germany which was used in Junker JU-52 aircraft flying on the Berlin-Rome-London route.