Definition
The Airport Arrival Rate (AAR) — the maximum number of arriving aircraft that an airport, or the airspace serving it, can accept from the Air Route Traffic Control Center (ARTCC) in one hour. The figure is set by the Air Traffic Control facility managing the airport and is adjusted for current conditions such as weather, runway configuration in use, and controller workload.
Plain English
It is the hourly limit on how many planes can be funneled into an airport from the high-altitude controllers handing them off. If the limit is 40 per hour, the center cannot send more than 40 arrivals per hour without causing delays or holding.
Context Anchor
Seen in air traffic flow management, especially when weather, runway closures, or heavy traffic reduce how many aircraft can be handled.
Why Pilots Care
Directly determines expected arrival delays, holding requirements, and possible diversions during periods of high demand or reduced capacity.
Analogy
Think of it like the checkout lanes at a busy store. No matter how many shoppers arrive, only so many can be processed per hour. If more show up than the lanes can handle, a line forms outside.
Grounding Statement
If thunderstorms reduce an airport’s arrival capacity, controllers may allow fewer aircraft to enter that airport’s flow each hour.
Intuition Check
Do not read “accept” as simple permission. Here it means the airport or airspace has enough safe operating capacity to receive that number of aircraft in one hour.
Example Sentence 1
With thunderstorms reducing the airport arrival rate to 24 per hour, the ARTCC began issuing holding instructions to inbound traffic.
Example Sentence 2
When the airport or airspace can accept from the ARTCC per hour dropped to thirty, several flights entered holding.