他们被禁止飞行任何航班，运送人除外。
They are banned from launching any flights except to transport people.
此次航班将飞行多长时间？
发表在《新英格兰医学杂志》上的一项研究估计，美国航班上每天平均会发生30起飞行中医疗紧急事件。
A study published in the New England Journal of Medicine estimated that there are an average of 30 in-flight medical emergencies on U.S. flights every day.
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