A UNICOM (universal communications) station is an air-ground communication facility operated by a non-air traffic control private agency to provide advisory service at uncontrolled aerodromes and airports and to provide various non-flight services, such as requesting a taxi, even at towered airports.[1] It is also known as an aeronautical advisory station, with these terms being used mostly in the Americas.[2] The equivalent European/ICAO service is known as (aerodrome) flight information service, abbreviated as AFIS or FIS. From an ICAO perspective, UNICOM, historically most commonly provided by flight service stations, is an implementation of FIS.[3]