AIR TRAFFIC CONTROL ADVISES - Used to prefix a message of noncontrol information when it is relayed to an aircraft by other than an air traffic controller. (See Advisory)
AIR TRAFFIC CONTROL ASSIGNED AIRSPACE/ATCAA - Airspace of defined vertical/lateral limits, assigned by Air Traffic Control, for the purpose of providing air traffic segregation between the specified activities being conducted within the assigned airspace and other IFR air traffic. (See Alert Area, Military Operations Area, Special Use Airspace)
AIR TRAFFIC CONTROL ASSIGNED AIRSPACE/ATCAA (Federal Aviation Administration 7610.4) - Airspace of defined vertical/lateral limits, normally within Positive Control Area, which is assigned by Air Traffic Control for the purpose of providing air traffic segregation between the specified activities being conducted therein, and other IFR air traffic.
AIR TRAFFIC CONTROL/ATC (P/CG) - A service operated by appropriate authority to promote the safe, orderly and expeditious flow of air traffic.
AIR TRAFFIC CONTROL CLEARANCE - (See Air Traffic Clearance)
AIR TRAFFIC CONTROL CLEARANCE (JCS, NATO, ICAO) - Authorization for an aircraft to proceed under conditions specified by an Air Traffic Control unit.
NOTE 1. - For convenience, the term Air Traffic Control clearance is frequently abbreviated to clearance when used in appropriate contexts.
NOTE 2. - The abbreviated term clearance may be prefixed by the words taxi, take-off, departure, enroute, approach or landing to indicate the particular portion of flight to which the Air Traffic Control clearance relates.
AIR TRAFFIC CONTROL COMMAND CENTER/ATCCC - An air traffic Operations service facility consisting of four operational units.
(1)
CENTRAL FLOW CONTROL FUNCTION/CFCF -Responsible for coordination and approval of all major interceptor flow control restrictions on a system basis in order to obtain maximum utilization of the airspace. (See Quota Flow Control)

(2)
CENTRAL ALTITUDE RESERVATION FUNCTION/CARF - Responsible for coordinating, planning and approving special user requirements under the Altitude Reservation (ALTRV) concept. (See Altitude Reservation)

(3)
AIRPORT RESERVATION OFFICE/ARO - Responsible for approving IFR flights at designated high density traffic airports (John F. Kennedy, LaGuardia, O’Hare and Washington National) during specified hours. (Refer to Federal Air Regulations Part 93, Airport/Facility Directory)

(4)
AIR TRAFFIC CONTROL CONTINGENCY COMMAND POST - A facility which enables the Federal Aviation Administration to manage the Air Traffic Control system when significant portions of the system capabilities have been lost or are threatened.

AIR TRAFFIC CONTROL INSTRUCTION - Directives issued by Air Traffic Control for the purpose of requiring a pilot to take specific actions; e.g., "Turn left heading two five zero", "Go around,"  "Clear the runway." (Refer to Federal Air Regulations Part 91)
AIR TRAFFIC CONTROL SERVICE (P/CG) - (See Air Traffic Control)
AIR TRAFFIC CONTROL SERVICE (JCS, NATO, ICAO) - A service provided for the purpose of:
(1) Preventing collisions;
(a) between aircraft; and

(b)
on the maneuvering area between aircraft and obstructions, and

(2)
Expediting and maintaining an orderly flow of air traffic.

AIR TRAFFIC CONTROL SPECIALIST/CONTROLLER (P/CG, ICAO) - A person authorized to provide Air Traffic Control service. (See Air Traffic Control Service, Flight Service Station)
AIR TRAFFIC SERVICE (ICAO) -A generic term meaning variously, flight information service, alerting service, air traffic advisory service, air traffic control service, area control service, approach control service or airport control service.
AIRWAY (JCS, NATO, ICAO) - A control area or portion thereof established in the form of a corridor equipped with radio navigational aids.
AIRWAY/FEDERAL AIRWAY (P/CG) - A control area or portion thereof established in the form of a corridor, the centerline of which is defined by radio navigational aids. (Refer to Federal Air Regulations Part 71).
　
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