FLIGHT INFORMATION REGIONS (FIRs) IN EUROPE

All airspace around the world is divided into Flight Information Regions (FIRs). Each FIR is managed by a controlling authority that has responsibility for ensuring that air traffic services are provided to the aircraft flying within it. FIRs vary in size.  Smaller countries may have one FIR in the airspace above them and larger countries may have several. Airspace over the ocean is typically divided into two or more FIRs and delegated to controlling authorities within countries that border it. In some cases, FIRs are split vertically into lower and upper sections.