Winter storm disrupts thousands of U.S. flights

Thousands of flights were disrupted Monday as a winter storm moved eastward, snarling air travel in the eastern U.S.

By 1:45 p.m. ET, more than 4,300 U.S. flights were delayed while another 1,880 were canceled, according to flight tracker FlightAware.

The storm, which was moving from the Ohio Valley to the mid-Atlantic, was set to dump as much as a foot of snow in the Washington, D.C., area, though cold weather stretched through the southern U.S., according to federal forecasters.

More than 250 flights, or two-thirds of the day's schedule, were canceled at Ronald Reagan Washington Airport, while about a third of the scheduled flights were canceled at each Washington Dulles Airport and Baltimore/Washington Thurgood Marshall Airport.

Each of the major New York-area airports had more than 100 flight delays, FlightAware tallies showed, and there were significant slowdowns at other major airports like Dallas/Fort Worth Airport and Chicago O'Hare Airport.

United, Southwest, American and other airlines waived change fees and fare differences for travelers affected by the storm.