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En-route charts are divided into high and low versions, with information on airways and navaids for high- and low-altitude flight, respectively. The division between low altitude and high altitude is usually defined as the altitude that marks transition to flight levels (in the United States, this is taken to be 18,000 feet MSL by convention).
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.
Houston Air Route Traffic Control Center, United States. The United States Federal Aviation Administration (FAA) defines an ARTCC as: [a] facility established to provide air traffic control service to aircraft operating on IFR flight plans within controlled airspace, principally during the en-route phase of flight.
An ARTCC controls aircraft flying in a specified region of airspace, known as a flight information region (FIR), typically during the en route portion of flight. The purpose of control is to promote the safe, orderly, and expeditious flow of air traffic [2] and prevent collisions.
Flight Watch is the common name in the United States for an En route Flight Advisory Service (EFAS) dedicated to providing weather to and collecting reports from pilots while in flight. While U.S. Flight Service Stations (FSS) operate Flight Watch, Flight Watch does not provide a full range of FSS services such as filing flight plans, acquiring ...
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:
The Aeronautical Information Service, or AIS (French: Service de l'Information Aéronautique, SIA) is a service established in support of international civil aviation, whose objective is to ensure the flow of information necessary for the safety, regularity, and efficiency of international air navigation.
The FAA's En Route Automation Modernization (ERAM) platform replaced the legacy Host system for en route air traffic control in 2015. [122] [123] A sustainment and enhancement program is in progress and scheduled to be completed in 2026. En route controllers can now track as many as 1,900 aircraft at a time, up from the previous 1,100 limit.