§ 240. Definitions. When used in this article,
1. "Aircraft" means any contrivance, now or hereafter invented, for avigation of or flight in the air, except a parachute or other contrivance designed for use, and carried primarily for safety equipment.
2. "Avigation" means the steering, directing or managing of an aircraft, in or through the air; and such term is here used as a substitute for "aerial navigation."
3. "Operating aircraft" means performing the services of aircraft pilot.
4. "Landing area" means any locality either of land or water, including airports and intermediate landing fields, which is used or intended to be used for the landing and take-off of aircraft, whether or not facilities are provided for shelter, servicing or repair of aircraft or for receiving or discharging passengers or cargo.
5. "Airport" means any landing area used regularly by aircraft for receiving or discharging passengers or cargo; or for the landing and take-off of aircraft being used for personal or training purposes.
6. "Acrobatic flying" means maneuvers not necessary for normal flight and intentionally performed by an aircraft, involving an abrupt change in its attitude, an abnormal attitude or an abnormal acceleration.
7. "Administrator of the federal aviation agency" means the administrator of the federal aviation agency of the United States.
8. "Airplane" means a mechanically propelled aircraft, the support of which in flight is derived dynamically from the reaction on surfaces in a fixed position relative to the aircraft but in motion relative to the air.
9. "Control zone" means an airspace of defined dimensions extending upwards from the surface of the ground and including one or more airports and designated as such by the administrator of the federal aviation agency.
10. "Flight visibility" means the average horizontal distance that prominent objects may be seen from the cockpit.
11. "Helicopter" means an aircraft, the support of which in the air is normally derived from airfoils mechanically rotated about an approximately vertical axis.