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Any aircraft deriving its lift in flight chiefly from aerodynamic forces is...
  • A
    an aeroplane.
  • B
    a rotorcraft.
  • C
    a heavier-than-air aircraft.
  • D
    a lighter-than-air aircraft.

ICAO Annex 7
1. Definitions

Aeroplane. A power-driven heavier-than-air aircraft, deriving its lift in flight chiefly from aerodynamic reactions on surfaces which remain fixed under given conditions of flight.

Heavier-than-air-aircraft. Any aircraft deriving its lift in flight chiefly from aerodynamic forces.

Lighter-than-air-aircraft. Any aircraft supported chiefly by its buoyancy in the air.

Rotorcraft. A power-driven heavier-than-air aircraft supported in flight by the reactions of the air on one or more rotors.

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