US air travellers have suffered tens of thousands of delayed and cancelled flights this week, prompting finger-pointing between airlines and their regulator and unnerving those with trips scheduled over the busy Independence Day holiday.
美国航空旅客本周遭遇无数航班延误和取消，导致航空公司与监管机构相互指责，并让那些计划在繁忙的独立日(Independence Day)假期旅行的人感到不安。
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