Definition
The specific volume of airspace assigned to and controlled by a single Air Route Traffic Control Center (ARTCC). It encompasses the lateral boundaries and altitude limits within which that Center provides air traffic control services, primarily to aircraft operating on IFR flight plans during the enroute phase of flight.
Plain English
The chunk of sky that one Air Route Traffic Control Center is responsible for. Each Center has its own piece of airspace, and aircraft flying through that piece talk to that Center's controllers.
Context Anchor
You may see this term when reading about en route air traffic control, Center frequencies, or handoffs from one controller to another.
Derivation
"Center" here is short for Air Route Traffic Control Center (ARTCC), the FAA facility that handles enroute traffic. "Area" refers to the geographic and vertical airspace block assigned to that facility. The phrase simply names the airspace owned by a particular Center.
Why Pilots Care
Pilots must know which Center’s Area they are in to select the correct frequency and receive the proper level of radar and separation service.
Intuition Check
Do not read “Center’s Area” as the area near the physical Center building. In this term, it means the airspace assigned to that FAA control facility.
Example Sentence 1
As the flight progressed eastbound, the controller handed them off to the next Center because they were leaving Kansas City Center's area.
Example Sentence 2
Request VFR flight following once you enter the next Center’s Area.