![]() The division among authorities is done by international agreement through the International Civil Aviation Organization (ICAO). Oceanic airspace is divided into oceanic information regions and delegated to a controlling authority bordering that region. Some FIRs encompass the territorial airspace of several countries. Smaller countries' airspace is encompassed by a single FIR larger countries' airspace is subdivided into a number of regional FIRs. FIRs are the largest regular division of airspace in use in the world today, and have existed at least since 1947. The International Civil Aviation Organization (ICAO) delegates which country is responsible for the operational control of a given FIR. In aviation, a flight information region ( FIR) is a specified region of airspace in which a flight information service and an alerting service (ALRS) are provided. Specified region of airspace Flight Information Regions for Italy
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