International Civil Aviation Organization (ICAO)

International Civil Aviation Organization (International Civil Aviation Organization; abbreviation: ICAO) is a specialized agency of the United Nations for the management of international civil aviation affairs, in 1944 at the invitation of the U.S. Government, 52 countries signed the Convention on International Civil Aviation, established on a temporary basis; later formally established on April 4, 1947, the The headquarters are located in Montreal, Canada.