International Civil Aviation Organization (ICAO)

The International Civil Aviation Organization (ICAO) is the specialized agency of the United Nations responsible for establishing international standards, recommended practices, and procedures for civil aviation. Its headquarters are in Montréal, Canada. ICAO’s standards form the basis for aviation regulations in most countries, including Canada.

What ICAO Does

• Develops Standards and Recommended Practices (SARPs) published in Annexes to the Chicago Convention
• Develops standardized meteorological codes (METAR, TAF, NOTAM formats)
• Sets standards for air traffic management, airspace classification, and navigation
• Coordinates international flight plan formats, phraseology, and procedures
• Sets international standards for pilot and controller licensing

ICAO and Canada

Canada is a founding signatory of the Convention on International Civil Aviation (Chicago Convention, 1944). Canadian aviation regulations (CARs) implement ICAO standards, often with Canadian-specific additions or variations. When a CARs provision differs from an ICAO standard, Canada notifies ICAO through a formal difference filing.

Related Terms

See also: IFR, VFR, Classification of Airspace.