Aida de Acosta Root Breckinridge (July 28, 1884 – May 26, 1962) was an American socialite and aviator.

On June 27, 1903, in Paris, when Acosta was nineteen, Brazilian pioneer aviator Alberto Santos-Dumont showed her how to operate his personal dirigible, "No.

Santos-Dumont was the toast of Paris at the time, flying his dirigible downtown to his favorite restaurant and parking it on the street while he had dinner.

They were certain that no man would marry a woman who had done such a thing, so they managed to hush it all up until many years later when in the 1930s she recounted the story to her husband and a young naval officer named Lieutenant George Calnan over dinner.

Also, Santos-Dumont, a lifelong bachelor with no known romantic ties, kept a photograph of Acosta on his desk, next to a vase of fresh flowers, for the rest of his life.