1. the person. 1. defects, physical and mental, of the pilot or the relevant authorities, such as health, unhealthy anxiety, fatigue is miserable. 2. lack of experience or lack of expertise in a plane. 3. the lack of responsibility of the plane like a plane with no excess speed. Not according to a given line, or lose the discipline to be negligence. 4. the loss of the pilot's flight discipline, such as not flying on a given route. 5. passenger aircraft does not follow the rules of the air such as cigarette butts or smoking stick by my lack of vigilance. The insurgents, while in the air, etc.
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