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Between 18, the German pioneer of human aviation Otto Lilienthal also studied heavier-than-air flight.

The Boeing 707, the first widely successful commercial jet, was in commercial service for more than 50 years, from 1958 to at least 2013.The engine weighed no more than 4 kg/k W (7 pounds per horsepower). By 1905, the Wright Flyer III was capable of fully controllable, stable flight for substantial periods.The Wright brothers credited Otto Lilienthal as a major inspiration for their decision to pursue manned flight.The broad spectrum of uses for airplanes includes recreation, transportation of goods and people, military, and research.Commercial aviation is a massive industry involving the flying of tens of thousands of passengers daily on airliners.

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