AirTrafficServicesAirspaces
urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirTrafficServicesAirspaces
Airspaces of defined dimensions, alphabetically designated, within which specific types of flights may operate and for which air traffic services and rules of operation are specified.
Source:
ICAO Annex 1,ICAO Annex 11,ICAO Annex 2,