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</html><description>When the Wright brothers launched their historic first flight on December 19, 1903, they had complete freedom to chart their own course through the sky. With the subsequent popularity of aviation as a sport and military tool, however, countries applied increased constraints on the ability of aviators to move through airspace. As more and more [&hellip;]</description><thumbnail_url>https://www.pbs.org/wnet/wideangle/files/2008/08/wa_img_flyingdown_map.jpg</thumbnail_url></oembed>

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