Definition
A service provided by non-tower flight service stations at airports without an operating control tower. The specialist gives pilots advisory information on known traffic, runway in use, wind, altimeter setting, and other airport conditions, but does not issue control instructions or clearances.
Plain English
At small airports without a control tower, the Flight Service Station can tell you what other planes they know about, which runway is being used, and the local wind and altimeter. They give you helpful information, but they don't direct traffic — you still make your own decisions.
Context Anchor
You encounter this term in discussions of traffic advisories, especially when talking with tower, approach, departure, or center controllers.
Derivation
Advisory comes from the Latin advisare, meaning 'to consider' or 'to give counsel.' The word signals that the information is offered to help the pilot decide — it is not a command. That distinction is the heart of this service.
Why Pilots Care
Supplies pilots with traffic advisories and routing suggestions that reduce the chance of conflicts in airspace without continuous radar coverage.
Intuition Check
Do not read “advisory” as “the controller is keeping me separated from everyone.” In this term, it means “the controller is giving me useful traffic information when available.”
Example Sentence 1
Approaching the non-towered field, the pilot called the Flight Service Station and received an air traffic advisory service report including the runway in use and one known aircraft in the pattern.
Example Sentence 2
Air traffic advisory service provided the location of a helicopter operating at the same altitude.