Definition
A category of non-safety, non-operational radio or data communications used by an airline or operator to handle the business and administrative side of a flight, such as crew scheduling, passenger service messages, catering, baggage handling, and company logistics. AAC is distinct from Air Traffic Control (ATC) communications and from Aeronautical Operational Control (AOC) messages that affect the safe conduct of the flight.
Plain English
Routine company messages between an aircraft and the airline's offices that handle business matters — things like crew rosters, passenger needs, or ground services — and have nothing to do with flying the aircraft safely.
Context Anchor
Seen in avionics, data-link, and airline operations discussions where different types of aircraft communications are being identified.
Why Pilots Care
Knowing the category matters because AAC traffic has lower priority than safety and operational messages. Pilots and dispatchers must not let administrative chatter compete with or delay communications that affect the safe conduct of the flight.
Intuition Check
Do not read “administration” as paperwork only. Here it means operational company support messages sent to or from the aircraft.
Example Sentence 1
The crew used the datalink to send an AAC message requesting wheelchair assistance for a passenger on arrival.
Example Sentence 2
Administrative details were sent over AAC so the main radio channels stayed clear for flight instructions.