For flight crew, there are statutory constraints on scheduling. These constraints include limitations on the maximum flying duty period, minimum rest periods, maximum scheduled duty hours, and minimum cumulative off-duty periods. In the United Kingdom proposed flight schedules have to be submitted by the airline management to the Flight Times Limitation Board of the Civil Aviation Authority before their introduction. Other countries have similar limitations, and within such frameworks airlines operate schedules that are further restricted by the need to meet the needs of passengers and to comply with night flying bans, peak hour saturation, and political influences on route planning. In addition, flight time limitations usually reflect conditions acceptable to industrial bodies rather than to medical advisers. The commercial need to keep aircraft flying, and so earning revenue, and the requirements of engineering schedules for airframe and engine inspection and checks are also relevant considerations.
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