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  The Wright brothers (Wilbur and Orville Wright) complete the first four sustained flights using a powered and controlled airplane.
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  Eugene Ely takes off a cruiser while piloting a biplane. Landing gear was modified for this.
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  World War I (1914-1918) drove the need for higher speed, higher altitude, and better maneuverability.
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  Hugo Junkers (German professor of mechanics) introduces first all-metal plane;built of duralumin (lightweight metal).
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  New air-cooled radial engines allow for bigger and faster planes.
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  Sir Robert Watson-Watt develops first practical radar for meteorological applications.
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  During World War II (1939-1945), many new advancements are made. British invent airplane-detecting radar. The Germans develop radio wave navigation techniques. Airborne radar is developed and later German invent first jet fighter: ME 262.
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  http://www.travelair.org/html/history/history_frame_tahistory.html
 http://www.gettyimages.com/detail/news-photo/douglas-dc-3-of-north-central-airlines-in-flight-news-photo/515550714#douglas-dc3-of-north-central-airlines-in-flight-picture-id515550714
 https://en.wikipedia.org/wiki/Messerschmitt_Me_262