Work schedules of air traffic controllers' (ATC) have led them to suffer from chronic fatigue that decreased their efficiency, a study by the US Federal Aviation Administration (FAA) has revealed. The study findings had not been made public by the US Government for several years, the Associated Press (AP) reported. Carried out by Nasa, the study was drafted on 1 December, 2011. It has also revealed that tight schedules have led to an endangering of the safety of the country's airspace.

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