Categories: Lebanon stubs | Aviation stubs | Airlines of Lebanon The International Air Transport Association is an international trade organisation of airlines headquartered in Montreal, Quebec, Canada. ... The International Civil Aviation Organization (ICAO), an agency of the United Nations, develops the principles and techniques of international air navigation and fosters the planning and development of international air transport to ensure safe and orderly growth. ... Most airlines employ a distinctive and internationally recognised call sign that is normally spoken during airband radio transmissions as a prefix to the flight number. ...