Definition
The ICAO term for an air traffic control facility primarily responsible for providing ATC service to IFR aircraft during the en route phase of flight. The U.S. equivalent facility is an Air Route Traffic Control Center (ARTCC).
Plain English
An ACC is the international name for the kind of control center that handles airliners and other IFR traffic while they are cruising between airports. In the United States, the same job is done by a facility called an ARTCC.
Context Anchor
Seen in international air traffic control references, flight planning, and radio procedures when a flight is being managed by an enroute control facility.
Derivation
Area' refers to the large block of airspace the facility is responsible for, rather than a single airport or terminal area. 'Control Center' is the physical facility where controllers work. The term comes from ICAO standards, which most countries outside the U.S. use directly.
Why Pilots Care
Pilots contact the ACC for route changes, altitude assignments, and traffic information during the cruise portion of IFR flights.
Intuition Check
Do not read ACC as a general office or airport building. In this context, it means the air traffic control facility responsible for a defined area of airspace.
Example Sentence 1
After leaving Frankfurt's terminal airspace, the crew was handed off to the area control center for the en route portion of the flight.
Example Sentence 2
Control transferred to the ACC once the flight left the terminal area and entered en route airspace.