Moving to America, Miller was a popular member of a group of female aviators that included Amelia Earhart, Bobby Trout, Pancho Barnes and Louise Thaden. As a competitor in international air races and a charter member of the first organization for women flyers, the Ninety-Nines, she quickly became famous. Her career was interrupted by her involvement in Lancaster's sensational Miami trial for the murder of her lover, Haden Clarke, and by Lancaster's disappearance a few years later while flying across the Sahara desert.