, are subject to a unique and exacting working environment, especially in high-performance military flying.
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In addition to the inherent cognitive demands placed on aircrew, additional factors, including hypoxia, acceleration forces in high-performance aircraft, operational pressure, enemy action, and circadian disruption, must be taken into consideration. Most fixed-wing commercial pilots work in a dry, contained environment, pressurized at 6000–8000 ft (1829–2438 m). Military high-performance aircraft are far less pressurized to reduce stress on the air frame