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Accumulations of snow, ice storms and tornadoes are causing thousands of flight delays and cancellations, as well as road closures in several areas of the United States. The situation would affect travelers who plan to travel in the coming days, whether by air or land, for the end-of-year holidays. We tell you what you should take into account. See also: More than 100 million people under alert due to strong winds: what areas will be affected?