Flat.
Avion.
She travelled by plane.
If you mean who invented it a french mathematician named Rene Descartes invented it.
je suis un avion means 'I am a plane' in French.
i traveled to french by plane
The plane is called the Cartesian plane after Rene Descartes, the French philosopher and mathematician.
The first person to have a specific disease e.g. For aids the patient zero was a Canadian/French plane steward.
avion
"Un avion."
'atterrir' (from suffix 'a' + noun 'terre', = earth, ground, soil) means 'to land' in French. "l'avion a atterri à dix heures" = the plane landed at 10 o'clock.
The inventor of the Cartesian plane was the French mathematician Rene Descartes.
plane un avion