As a winter storm knocks out power and snarls traffic from Oklahoma to the Mid-Atlantic, the flight-tracking website FlightAware reported thousands of airline delays and cancellations Monday. 

What You Need To Know

  • A winter storm is snarling air traffic from the Midwest to the Mid-Atlantic

  • Ronald Reagan Washington National Airport in Arlington, Virginia, has seen the largest number of flight delays and cancellations

  • Southwest and American Airlines have seen the most cancellations and delays

  • More than 4,500 flights into, within our out of the United States have been delayed and nearly 1,900 have been canceled as of Noon ET Monday, according to FlightAware.com

More than 4,500 flights within, into or out of the United States had been delayed and nearly 1,900 had been canceled as of 2 p.m. Eastern.

Ronald Reagan Washington National Airport in Arlington, Virginia, has seen the largest number of outgoing flight cancellations and delays, followed by Baltimore/Washington International and Washington Dulles International. Reagan Washington has also seen the largest number of incoming flight cancellations and delays, followed by Chicago O’Hare and Baltimore/Washington International.

Washington, D.C., is currently under a winter storm warning for heavy snow. The National Weather Service expects that up to 12 inches of snow could fall in the area by Tuesday.

Among airlines, Southwest has seen the largest number of canceled flights. American Airlines has seen the greatest number of delayed flights.