An airport code is a short code used to identify a specific airport. There are two international systems used:

• IATA airport code, a three-letter code which is more commonly known to the public
• ICAO airport code, a four-letter code which is more commonly used internationally

In the United States, Federal Aviation Administration airport codes generally mesh with those from IATA. Those airports that do not have either an IATA or ICAO airport code are given a Location Identifier, which often have mixed letters and numbers for small municipal or private airports.

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