Most FAA identifiers agree with the corresponding IATA codes, but some do not, such as Saipan whose FAA identifier is GSN and its IATA code is SPN, and some coincide with IATA codes of non-US airports. IATA codes should not be confused with the FAA identifiers of US airports. In addition, since three letter codes starting with Q are widely used in radio communication, cities with "Q" beginning their name also had to find alternate codes, as in the case of This practice is not followed outside the United States: Karachi is KHI,Īnd Nagoya is NGO. HVN for New Haven, Connecticut, ORF for Norfolk, Virginia,īNA for Nashville, Tennessee (whose airport's original name was Berry Field), and cities whose names begin with one of these letters had to adopt "irregular" airport codes: Navy reserved "N" codes, and to prevent confusion with Federal Communications Commission broadcast call signs, which begin with "W" or "K", the airports of certain U.S. Naming conventions National policies United States This system allowed for 17,576 permutations, assuming all letters can be used in conjunction with each other. This system became unmanageable for cities and towns without an NWS identifier, and the use of two letters allowed only a few hundred combinations a three-letter system of airport codes was implemented. Initially, pilots in the United States used the two-letter code from the National Weather Service (NWS) for identifying cities. However, many railway administrations have their own list of codes for their stations, such as the list of Amtrak station codes.Īirport codes arose out of the convenience that the practice brought pilots for location identification in the 1930s. A list of railway station codes, shared in agreements between airlines and rail lines such as Amtrak, SNCF, and Deutsche Bahn, is available. Īlphabetical lists of airports sorted by IATA code are available. IATA provides codes for airport handling entities, and for certain railway stations. The codes are published semi-annually in the IATA Airline Coding Directory. The assignment of these codes is governed by IATA Resolution 763, and it is administered by the IATA's headquarters in Montreal, Canada. The characters prominently displayed on baggage tags attached at airport check-in desks are an example of a way these codes are used.
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