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In some cases there is a vertical division of the FIR, in which case the lower portion remains named as such, whereas the airspace above is termed an upper information region (UIR). A flight information service and an alerting service are the basic levels of air traffic service, providing information pertinent to the safe and efficient conduct ...
The boundary between flight information regions and UIRs vary by country, but is usually above FL245 (24,500 feet) or FL660 (66,000 feet) depending on jurisdiction. [2] They are used to manage high level traffic such as commercial airliners and military aircraft. Some countries may have their boundary below FL245.
Area control centers (ACCs) control IFR air traffic in their flight information region (FIR). The current list of FIRs and ACCs is maintained by the International Civil Aviation Organization (ICAO). The following is the alphabetic list of all ACCs and their FIRs as of October 2011 [update] :
(The Upper Flight Information Region (UIR) boundary begins at FL245 (24,500 ft; 7,450 m) .) Some airways and CTAs may have sections of Class C. Class D: The CTRs and CTAs around the busier airports such as Stansted, Gatwick, Glasgow, Birmingham, Jersey, Manchester and Heathrow. A few airways in less busy areas are class D, allowing mid-level ...
The related implementation of flight information service is commonly known as UNICOM, but in some situations, this service is provided by the primary FSS frequency (callsign RADIO), in addition to which a few U.S. airports now also have bespoke AFIS services, but this is implemented as a recording similar to ATIS and AWOS, not a live service.
In air traffic control, an area control center (ACC), also known as a center or en-route center, is a facility responsible for controlling aircraft flying in the airspace of a given flight information region (FIR) at high altitudes between airport approaches and departures.