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ICAO

ICAO Airspace Classification

Most countries are member of the International Civil Aviation Organization (ICAO) and as such have signed the "Chicago Convention 1944" (111 pages, 2 Mb). Aviation rules and regulations in member countries are based on the recommendations made by the ICAO.

ICAO Annex 11: Air Traffic Services, Chapter 2, Section 2.6 describes the classifications of airspaces classes A - G and the services the pilot may expect from air traffic control. The table below shows this in a more comprehensible form.

Airspace Separation & Services

All currently defined ICAO Airspace classes A through G are listed in the table below:

ICAO Airspace Classification
Class Flight RulesSeparationService ProvidedSpeed LimitCommunication RequiredATC Clearance
AIFR onlyAll AircraftAir Traffic ControlNot applicableTwo wayYes
BIFRAll AircraftAir Traffic ControlNot applicableTwo wayYes
VFRAll AircraftAir Traffic ControlNot applicableTwo wayYes
CIFRIFR from IFR, IFR from VFRAir Traffic ControlNot applicableTwo wayYes
VFRVFR from IFRATC and Traffic Information250 kts below 10000ftTwo wayYes
DIFRIFR from IFRAir Traffic Control, Traffic Info about VFR flights250 kts below 10000ftTwo wayYes
VFRnilIFR/VFR and VFR/VFR Traffic Information250 kts below 10000ftTwo wayYes
EIFRIFR from IFRAir Traffic Control, Traffic Info as far as practicable about VFR flights250 kts below 10000ftTwo wayYes
VFRnilTraffic Information as far as practicable250 kts below 10000ftNoNo
FIFRIFR from IFR as far as practicableAir Traffic Advisory, Flight Information Service250 kts below 10000ftTwo wayNo
VFRnilFlight Information Service250 kts below 10000ftNoNo
GIFRNilFlight Information Service250 kts below 10000ftTwo wayNo
VFRnilFlight Information Service250 kts below 10000ftNoNo

Based on: ICAO Annex 11: Air Traffic Services, Chapter 2, Section 2.6 and Appendix 4. Read the full details in the original Annex 11 here.

Remember that each country can and does apply changes to the standard ICAO airspace classification, so be sure to read the most current relevant AIP.

Written by EAI.


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