A major winter blast of snow, ice, wind and plunging temperatures in the U.S. stirred dangerous travel conditions from central and southern states all the way to the East Coast early Monday, prompting several delays and cancellations at Phoenix Sky Harbor Airport.

Flight cancellations and delays are stacking up as a major winter storm makes its way across the East Coast. As of about 10 a.m. EST, there were 1,525 flight cancellations and 1,931 flight delays within,

More than 4,000 U.S. flights were delayed and more than 1,000 were canceled as a winter storm moved eastward. The winter storm was set to dump about a foot of snow on areas around Washington, D.C. The worst of the disruptions were centered in and around Washington,