An airport code is a short code used to identify a specific airport. Two international systems are used:
- IATA airport code, a three-letter code which is most commonly known to the public because of its use in reservation, ticketing, and baggage-handling systems
- ICAO airport code, a four-letter code which is most commonly used by air-traffic control systems and for airports that do not have an IATA airport code (generally those without scheduled commercial flights)
In the United States, Federal Aviation Administration Location Identifiers are generally the same as the IATA airport codes. Small municipal or private airports that do not have an IATA airport code are given a Location Identifier that usually includes numbers (to avoid conflict with future and existing IATA airport codes).
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