Definition
A continuous broadcast of recorded non-control airport and weather information for arriving and departing aircraft at busier airports. Each broadcast is updated when conditions change and is identified by a sequential phonetic letter (Information Alpha, Bravo, Charlie, and so on). It typically includes the current weather, active runways, approaches in use, and any relevant notices to airmen.
Plain English
A recorded radio message that tells pilots the latest airport conditions before they call the tower, so the controllers don't have to repeat the same information to every aircraft.
Context Anchor
Pilots use it before departure, before arrival, and when planning radio calls at airports that provide the service. It is commonly called ATIS.
Derivation
Automated' because it plays on a loop without a controller speaking live each time. 'Terminal' refers to the airport area (arrival and departure phase of flight, as opposed to en route). Together: an automatic broadcast covering the airport environment.
Why Pilots Care
Reduces radio congestion by letting pilots obtain routine airport information on their own, freeing controllers for time-critical instructions.
Intuition Check
Do not read “terminal” as the passenger terminal building. Here, “terminal” means the airport operating area and nearby airspace. Do not read “automated” as a two-way conversation. It is information being broadcast for pilots to receive.
Example Sentence 1
Before calling ground for taxi, the student listened to ATIS and noted that Information Bravo was current.
Example Sentence 2
After the Automated Terminal Information Service was updated with new wind and visibility information, the pilot adjusted the landing plan accordingly.