Source : Webster's Revised Unabridged Dictionary (1913)

Aviator \A"vi*a`tor\, n.
   The driver or pilot of an a["e]roplane, or heavier-than-air
   flying machine.

Aviator \A"vi*a`tor\, n.
   (a) An experimenter in aviation.
   (b) A flying machine.

Source : WordNet®

aviator
     n : someone who operates an aircraft [syn: {aeronaut}, {airman},
          {flier}, {flyer}]