Editing Airspace class (section)

===Australia===
[[Australia]] has adopted a civil airspace system based on the United States National Airspace System (NAS):

*'''Class A''' is used above {{Flight level|180}} along the populated coastal areas, and above {{Flight level|245}} elsewhere.
*'''Class B''' is not used.
*'''Class C''' is used in a 360° funnel shape in the Terminal Control Zones of the major international airports, extending up to the base of the Class A, generally at {{Flight level|180}} over these airports. It also overlays Class D airspace at smaller airports.
*'''Class D''' is used for the Terminal Control Zones of medium-sized airports, extending from the surface up to {{convert|2500|ft|m|-1}} AGL (depicted in MSL on a chart). Above this, Class C airspace is used, although generally only in a sector, and not 360° around the airport.
*'''Class E''' is used along the populated coastal areas, from {{convert|8500|ft|m|-1}} to the base of the overlying Class A or Class C airspace.
*'''Class F''' is not used.
*'''Class G''' is used wherever other classes are not—almost always from the surface to the base of the overlying Class A, C, D or E airspace.

====Transition from GAAP to Class D====
Australia used to have a non-standard class of airspace for use at the [[List of Australian capital cities|capital city]] [[general aviation]] airports, called a General Aviation Airport Procedures Zone (GAAP Zone). A control tower provided procedural clearances for all aircraft inside the zone. Additionally, any aircraft operating within {{convert|5|nmi|abbr=on}} of the zone must obtain a clearance. VFR aircraft arrive and depart using standard arrival and departure routes, while instrument arrival and departure procedures are published for IFR operations. During [[visual meteorological conditions]] (VMC), IFR aircraft are not provided with full IFR services. During [[instrument meteorological conditions]] (IMC), or marginal VMC, VFR operations are restricted in order to facilitate full IFR service for IFR aircraft.

In June 2010, all GAAP aerodromes were changed to Class D aerodromes, and the previous Class D procedures were changed. The new Class D procedures are similar to the FAA Class D procedures. VFR aircraft are no longer required to enter the airspace via set inbound/outbound points, however can be directed there by ATC. VFR and IFR aircraft now require taxi clearance in the "manoeuvring area" of the aerodrome, but can still taxi within set apron areas without a clearance. IFR aircraft now receive slot times and the visibility requirements of Special VFR are reduced from 3000m visibility to 1600m.