At recent years, air traffic demand increased at double-digit figures at several Brazilian airports and as a consequence increased controller workload was observed at many Sectors of the Air Traffic Control Facilities, with clear indications that demand consistently surpassed the available capacity of airports and air traffic control units. Although determination of air traffic control capacity values is still a very subjective and controversial issue, with no proven and universally accepted method in place, there is no doubt that there are limits and operating at values above a certain threshold will impact the systems efficiency, and, ultimately, also its safety. Demand is defined as the number of aircraft requesting to use the Air Traffic Management system ABSTRACT
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