Search Results

. Intermittent hypoxic exposure is also associated with secondary polycythemia. 12 , 19 , 21 The airplane cockpit shares a ventilation and pressurization system with the rest of the cabin. When cruising, modern airplanes’ altitude typically starts from 1813 ft (553 m), 7 with a mean pressurized cabin altitude of 6309 ft (1923 m) for airplanes with a pressurization system. 15 The Federal Aviation Administration (FAA) regulates a ceiling of 12,500 ft (3810 m) for unpressurized flights without oxygen supplement, above which the flight cannot be more than 30 min. 6 The cabin