ICAO CODE

The International Civil Aviation Organization (ICAO) defines several important codes for use in international aviation:

★ ICAO airport codes or ''location indicators'' (published in ICAO Document 7910 - ''Location Indicators''): 4-letter codes like LSZH for Zuerich or HECA for Cairo

★ ICAO airline designators (published in ICAO Document 8585 - ''Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services''): 3-letter codes like BAW for British Airways or AFR for Air France

★ ICAO aircraft type designators (published in ICAO Document 8643 - ''Aircraft Type Designators''): 4-letter codes like A320 for Airbus 320 or B772 for Boeing 777-200

★ ICAO 24bit aircraft addresses: allocation of 24 bit addresses to states to uniquely identify aircraft worldwide