air traffic control service means a service provided for the purpose of:
Vapor control system means a system that prevents release to the atmosphere of gasoline vapors in excess of 80 milligrams per liter of gasoline loaded (4.7 grains per liter).
air traffic control unit means a generic term meaning variously, area control centre, approach control unit or aerodrome control tower;
Access Tandem Switch is a Switch used to connect End Office Switches to interexchange Carrier Switches. Qwest's Access Tandem Switches are also used to connect and switch traffic between and among Central Office Switches within the same LATA and may be used for the exchange of local traffic.
aerodrome control service means air traffic control service for aerodrome traffic;