Where are ICAO codes being used?

ICAO codes are also used to identify other aviation facilities such as weather stations, international flight service stations or area control centers, whether or not they are located at airports. Flight information regions are also identified by a unique ICAO-code.



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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.

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The ICAO airport codes, also known as location indicators, are the four-letter sequences used by pilots and air traffic controllers in their charts, on-board systems and in communications.

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ICAO airport codes are of great importance to pilots as they allow them to uniquely identify each airport around the world. This is essential for air navigation, as pilots need to know exactly which airport they are using in order to plan their route and make navigational decisions in the air.

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ICAO codes are the next most widely recognized codes. While IATA codes specifically support the airline travel industry, ICAO codes more broadly support international flight operations regardless of the type of operation (to include general and business aviation).

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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.

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The term non-Contracting States refer to those States which have not ratified nor adhered to the Chicago Convention but that are Members of the UN or of a Specialized Agency. The only non-Contracting States are the Holy See and Liechtenstein.

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Currently, there are 193 members or contracting states in ICAO, which is governed by the ICAO Council, which is composed of 36 member states including the United States.

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By partnering for mutual benefit, IATA works with governments, international organizations such as the International Civil Aviation Organisation (ICAO), and other relevant authorities to help the development of global value chains and to define the correct regulatory framework for the industry.

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They are defined by the International Civil Aviation Organisation (ICAO) and are used by Air Traffic Control (ATC) and airline operations for flight planning. Typical examples are London Heathrow (ICAO: EGLL) and London Gatwick (ICAO: EGKK).

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Airport codes are now assigned to airports by IATA, the International Air Transport Association, and no two airports can have the same code. (Note to pilots and dispatchers: these can be different than the four-character ICAO codes—i.e., DAL vs. KDAL, or LHR vs.

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As IATA airlines are somewhat stricter in their requirements than the ICAO Technical Instructions, the DGR specifies more precisely how to prepare a shipment.

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