Flying machines were a type of aircraft.
Leonardo da Vinci was inspired by the Monk to design a type of flying machine. (TV: The Time Meddler) In the 21st century, a picture of Leonardo's flying machine was on display in Daniel Eldred's space museum. (TV: The Seeds of Death) Astrolabus escaped from the Sixth Doctor in a da Vinci flying machine. (COMIC: Voyager)