Editing Airspace class (section)

===United Kingdom===
{{unordered list
|'''Class A''':
*Most airways up to {{Flight level|195}} with the exception of airways lying within the [[Belfast International|Belfast]] CTR/TMA and around Scotland.
*The Terminal Control Areas (TMAs) around [[London Heathrow Airport]], [[Birmingham Airport|Birmingham]] and [[Manchester Airport|Manchester]].
*The Channel Island Zone is Class A above {{Flight level|80}}.
*The CTAs of Daventry, Clacton, Cotswold and Worthing.
Airways typically start at {{Flight level|70}} and routing options become more attractive above {{Flight level|140}}.
|'''Class B''': Not currently used in the UK.
|'''Class C''': All UK airspace between {{Flight level|195}} and {{Flight level|660}}. (The Upper Flight Information Region (UIR) boundary begins at {{Flight level|245}}.)<p>Some airways and CTAs may have sections of Class C.</p> 
|'''Class D''': The CTRs and CTAs around the busier airports such as [[London Stansted Airport|Stansted]], [[London Gatwick|Gatwick]], [[Glasgow International Airport|Glasgow]], [[Birmingham Airport, England|Birmingham]], [[Jersey Airport|Jersey]], [[Manchester Airport|Manchester]] and [[Heathrow Airport|Heathrow]].
A few airways in less busy areas are class D, allowing mid-level military VFR flights.
|'''Class E''': Parts of the Belfast TMA and ATS routes in Scotland. A clearance is not required for VFR flights within Class E airspace, however pilots are strongly advised to contact the appropriate ATS.
|'''Class F''': Not currently used in the UK. All remaining Class F airspace was removed or converted to Class E or G in November 2014.
|'''Class G''': All remaining airspace, comprising by far the largest part of the airspace below {{Flight level|195}}. The UK is unusual in that it has not adopted a widespread class E system of airways for most airspace lower than {{Flight level|70}}. Therefore, for light aircraft, IFR flight in Class G airspace is relatively common. Use of a radio or transponder is not required, even in IMC.<ref>{{cite web |url=http://www.caa.co.uk/docs/64/200890108ATSAirspaceClassificationV3.pdf |title=UK ATS Airspace Classifications |access-date=2010-01-22 |url-status=dead |archive-url=https://web.archive.org/web/20110606111636/http://www.caa.co.uk/docs/64/200890108ATSAirspaceClassificationV3.pdf |archive-date=2011-06-06 }}</ref> ATC units may provide an "as far as practical" form of separation between some such flights, but participation in the service is voluntary.<ref>{{cite web |title=New Air Traffic Services Outside Controlled Airspace (ATSOCAS) interactive guide now available |date=20 June 2008 |website=Air Space Safety |publisher=Airspace & Safety Initiative (ASI) |url=http://www.airspacesafety.com/content/ATSOCAS.asp |archive-url=https://web.archive.org/web/20100103021920/http://www.airspacesafety.com/content/ATSOCAS.asp |archive-date=January 3, 2010 }}</ref>}}

In addition the UK has a couple of special classes of airspace that do not fall within the ICAO classes:

*'''Aerodrome traffic zones''' (ATZ) are circular zones around an airport with a radius of 2&nbsp;nmi or 2.5&nbsp;nmi depending on runway length, extending from the surface to {{convert|2000|ft|m|-2|abbr=on}} AAL (above aerodrome level). Aircraft within an ATZ must obey the instructions of the tower controller (if present), or must make radio contact with the Aerodrome Flight Information Service unit or Air/Ground Communication Service unit for the aerodrome before entering the zone (in the case of an uncontrolled airfield), or must obey ground signals if non-radio.<ref>{{cite book |title=The Air Pilot's Manual: Aviation Law And Meteorology |last=Godwin |first=Peter |location=Cranfield, England |publisher=Air Pilot Publishing Ltd |year=1987–2004}}</ref>
*'''[[Military Aerodrome Traffic Zone|Military air traffic zones]]''' (MATZ) are zones around military air bases in class G airspace. Military aircraft treat these as if they are controlled airspace; civilian traffic are advised but not obliged to do the same (although they must respect the ATZ contained within the MATZ). A MATZ usually consists of a circular zone with a radius of 5&nbsp;nm, extending from the surface to {{convert|3000|ft|m|-2|abbr=on}} AAL (above aerodrome level). Stubs 4&nbsp;nm wide and 5&nbsp;nm in length, orientated with the aerodrome's main runway, extend on opposite sides of the central circle, extending from {{convert|1000|ft|m |-2|abbr=on}} to {{convert|3000|ft|m|-2|abbr=on}} AAL.