The first objects to fly that carried people were balloons, which were pioneered in France by the Montgolfier brothers in 1783. Some of the basic scientific principles of heavier-than-air flight were laid down in England in the early 19th century by Sir George Cayley. In the 1890s Otto Lilienthal of Germany became the first person to make and fly successful gliders. The American brothers Wilbur and Orville Wright were inspired by Lilienthal and by 1902 had developed a fully practical biplane (double-winged) glider that could be controlled in every direction. Fitting a small engine and two propellers to another biplane, the Wrights on December 17, 1903, made the world’s first successful human-carrying engine-powered heavier-than-air flight at a site near Kitty Hawk, on the coast of North Carolina.The Wright brothers’ success soon inspired successful aircraft designs and flights by others, and World War I (1914–18) further accelerated the expansion of aviation. Though initially used for aerial reconnaissance, aircraft were soon fitted with machine guns to shoot at other aircraft and with bombs to drop on ground targets; military aircraft with these types of missions and armaments became known, respectively, as fighters and bombers.
