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Universal Postal Union Series1949Anniversary of Powered Flight1949, 1953Wright Brothers and their FlyerC45%u2014December 17, 1949Because Post Office policy prohibited stamps honoring living persons, the Wright Brothers could not be so honored until after Orville%u2019s death in 1948 (Wilbur had died in 1912). A stamp was issued the very next year, on the 46th anniversary of their first powered flight at Kitty Hawk, North Carolina.Four years later, on the 50th anniversary of the Wright%u2019s historic flight, another anniversary-of-flight stamp was issued. The brothers were also honored in a pair of 1978 Pioneers in Aviation stamps.Post Office BuildingC42%u2014November 18, 1949Globe and DovesC43%u2014October 7, 1949Boeing StratocruiserC44%u2014November 30, 1949These stamps commemorated the 75th anniversary of the Universal Postal Union. Prior to its formation in 1874, countries had to have postal treaties with each nation they wanted to exchange mail with, and a letter had to have stamps from each country it would pass through.Wright Flyer and a Modern PlaneC47%u2014May 29, 1953