ICAO codes versus IATA codesFor example, the IATA code for London's Heathrow Airport is LHR and its ICAO code is EGLL.
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Every airport in the world is given a three-letter code from the International Air Transport Association (IATA) and a four-letter code from International Civil Aviation Organization (ICAO).
ICAO codes are filed on air traffic control flight plans and are the international standard used worldwide for interoperability between air navigation service providers. As such, pilots, dispatchers, and air traffic controllers work primarily in the ICAO airport code scheme.
Both IATA and ICAO are international organizations that oversee civil aviation operations. However, the IATA generally supports the airline industry, while the ICAO provides global standards for air transport operations. Furthermore, the IATA uses a different list of airport codes that passengers can easily relate to.
Cities with multiple commercial airports. In large metropolitan areas, airport codes are often named after the airport itself instead of the city it serves, while another code is reserved which refers to the city itself which can be used to search for flights to any of its airports.
ICAO airline designatorThese codes are unique by airline, unlike the IATA airline designator codes (see section above). The designators are listed in ICAO Document 8585: Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services. ICAO codes have been issued since 1947.
The International Air Transport Association's (IATA) Location Identifier is a unique 3-letter code (also commonly known as IATA code) used in aviation and also in logistics to identify an airport.
As IATA airlines are somewhat stricter in their requirements than the ICAO Technical Instructions, the DGR specifies more precisely how to prepare a shipment.
IATA Members?From 57 founding members in 1945, IATA now represents some 300 airlines in over 120 countries. Carrying 83% of the world's air traffic, IATA members include the world's leading passenger and cargo airlines.
The top five countries in the ICAO ranking are Iceland (95.73%), France (96.42%), South Korea (98.24%), UAE with a score of 98.8% and Singapore with a score of 99.69%.The US was in 22nd place and Qatar in 25th place.China is in 49th place.