A snow storm in the Midwest and high winds along the East Coast have delayed or grounded flights on one of the busiest travel days of the year.

Travelers have had to endure schedule changes on Friday resulting from the cancellation of 1,000 flights Thursday due to the Midwest storm. On Friday, rain and wind gusts of up to 45 mph at airports in the New York City area compounded travel woes.

As of 12:30 p.m., many flights in and out of the Midwest, including Kansas City, Chicago, and Oklahoma City, that were bound for BWI Thurgood Marshall airport have been delayed. Flights to and from New York City, Newark, and Philadelphia are also delayed.

At Dulles International, flights are running smoothly with few delays.

Some flights to Reagan National have been cancelled. Affected airlines include: American, Delta, US Airways, and AirTran Airways.

The midwest storm produced blizzards across the Great Lakes region and tornados to the south. The dangerous weather system is being blamed for at least seven deaths.

More than 5 million people are expected to fly between Dec. 19 and Jan. 1, according to AAA.