Description

Aeronautical station (and therefore, ATS unit) callsigns normally comprise two parts: the name of a location and a suffix. ICAO Annex 11 recommends that the first part (the location name) is:

• for an Area control centre (ACC) or a Flight information centre (FIC) - a nearby town/city or a geographic feature
• for an Aerodrome control tower or an Approach control unit - the name of the aerodrome served

The suffix indicates the type of service being provided (the examples below are defined in ICAO Doc 9432):