Location Indicators (Doc 7910) is a listing of four-letter location indicators and, where available, corresponding three-character International Air Transport Association (IATA) location identifier codes for aerodromes and other geographical locations throughout the world, and a list of the addresses of centres in charge of flight information regions (FIR) and/or upper flight information regions (UIR). These codes are defined by the International Civil Aviation Organization (ICAO) and published in the manual on Location Indicators (Doc 7910). Stability in location indicators assigned is important, hence changes should be made only after due consideration. This document is published quarterly as a service to international aviation.
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