The International Civil Aviation Organization (ICAO) defines several important codes for use in international aviation:
- International Civil Aviation Organization airport codes or location indicators (published in ICAO Document 7910 - Location Indicators): 4-letter codes like LSZH for Zürich or HECA for Cairo
- Airline codes or 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
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