Boeing 247

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The Boeing Model 247 is an early American airliner, and one of the first such aircraft to incorporate advances such as all-metal semimonocoque construction, a fully cantilevered wing, and retractable landing gear. Other advanced features included control surface trim tabs, an autopilot and de-icing boots for the wings and tailplane. The 247 first flew on February 8, 1933, and entered service later that year.