While large numbers of airplanes had been produced in America for the war effort overseas at the Western Front, it was found that that the British, French and Germans were far ahead of them when it came to flight technology, which led to a huge surplus of airplanes in the United States. The government's solution to recover some of the money was to sell the surplus stock off for as little as $200 dollars each.With no license being required to fly a plane, the offer attracted many ex-fighter pilots as well as civilians, who developed a new American pastime known as barnstorming. Part entertainers, part thrill-seekers, the barnstormers made their way across the country as solo acts and in groups called 'Flying Circuses'.The American flier Ormer Locklear wowed the crowds by climbing out of his airplane and walk along the wing, and it wasn't long before flying circuses held less appeal for spectators if it didn't have a wing-walking act. Handstands, jumps across planes, and even the odd game of tennis were attempted by barnstormers to attract larger paying audiences.In 1936, the US Government banned wing-walking under 1,500 ft, which doomed aerial stunting, and while a few wing-walking teams operated in the 1970s, it wasn't until barnstormer Vic Norman founded his famous AeroSuperBatics wing-walking team in the early 1980s that the sight of daredevils hand-standing and flying upside down on the wing was seen in Europe. Several teams around the world subsequently formed using airplanes such as the Boeing Stearman or the Curtiss 'Jenny' biplanes to wow crowds as a part of regular air displays, and their appeal has continued to rise since the 2000s.