(1) A controlled airspace of defined dimensions that is normally established in the vicinity of one or more major aerodromes and within which ATC service is provided based on the airspace classification. See also: Terminal Area (2) (US) A Controlled Airspace Extending Upward From The Surface or Higher To Specified Altitudes, Within Which All Aircraft Are Subject To Operating Rules and To Pilot and Equipment Requirements Specified in FAR 91. See also: Terminal Area