Clifford "Cliff" Henderson (1895–1984) was the managing director of the National Air Races from 1928 through 1939. Described as "the Barnum of aviation," he obtained sponsors for two of the most well-known air races of the period, the Bendix transcontinental and the Thompson closed-course classics. The Thompson Trophy was first awarded in 1929. The 1929 National Air Races included the first official women-only event, the Women's Air Derby, a cross-country race from Los Angeles to Cleveland, Ohio. In 1931, he convinced businessman Vincent Bendix to sponsor the Bendix Trophy Race, a transcontinental speed dash open to men and women. Henderson was awarded the L'Ordre de 'Etoile Noire de Benin for his service in World War II as the U.S. Air Force Military Commissioner of Dakar.