In the history of stewardesses: "In the earliest days of commercial flight, there were teenage cabin boys, and the first female stewardesses had to be registered nurses."
The 2009 book Flying Across America: The Airline Passenger Experience by Daniel L. Rust says, "Dressed in hospital whites or military-style uniforms, a 'sky girl' of the 1930s not only served meals and soothed nerves...
Is any type of medical certification required for flight attendants in the US or other parts of the world?