Flight Information Region (FIR)

An airspace of defined dimensions within which Flight Information Service and Alerting Service are provided.
  1. Flight Information Service. A service provided for the purpose of giving advice and information useful for the safe and efficient conduct of flights.
  2. Alerting Service. A service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid and to assist such organizations as required.

Source: Pilot Contoller Glossary (PCG)

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