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Related to controlled airspace: Uncontrolled airspace
controlled airspace[kən¦trōld ′er‚spās]
An airspace of defined dimensions within which air-traffic control is provided.
terminal control area, or transition area, within which some or all aircraft may be subject to air traffic control areas, is a component of controlled airspace. Each Class B, Class C, and Class D airspace area designated for an airport contains at least one primary airport around which the airspace is designated.
controlled airspace (instrument restricted)
Controlled airspace within which only IFR (instrument flight rules) flights are permitted (ICAO). Airspace Class A is an instrument-restricted controlled airspace.
controlled airspace (instrument/visual)
Controlled airspace within which only IFR (instrument flight rules) and controlled VFR (visual flight rules) flights are permitted (ICAO).
controlled airspace (visual exempted)
Controlled airspace within which both IFR (instrument flight rules) and VFR (visual flight rules) flights are permitted, but VFR flights are not subject to control (ICAO).