In this case, alleviating measures, such as control of air traffic flow, will need to be considered, particularly when the ATC system can no longer fully cope with the volume of air traffic. An optimum flow of air traffic is not always possible due to various constraints, such as conflicting users’ requirements, air navigation system limitations and unexpected weather conditions. To be effective, it needs cooperation and co-ordination with ATC units and airspace users. ATC capacity reflects the ability of the system to provide service, and is expressed in numbers of aircraft entering a specified portion of the airspace in a given period of time.ĪTFM supports ATC in meeting its main objectives as well as of achieving the most efficient utilization of airspace and airport capacity. It comprises activities related to traffic organization and handling in a way that is safe, orderly, expeditious and kept within the capacity. The objective of ATFM is to ensure optimal traffic flow when demand is expected to exceed the available capacity of the ATC system. Source: ICAO Doc 4444 PANS-ATM Description A service established with the objective of contributing to a safe, orderly and expeditious flow of air traffic by ensuring that ATC capacity is utilized to the maximum extent possible, and that the traffic volume is compatible with the capacities declared by the appropriate ATS authority.
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