Airline passengers at Dulles International Airport outside Washington, DC, in Virginia, arrive to snow showers on the busiest travel day of the year November 26, 2014. Hundreds of flights were cancelled or delayed Wednesday in the US northeast as a winter storm delivered freezing rain and snow ahead of the Thanksgiving holiday, one of the year's biggest travel weekends. A wintry mix was falling in Boston, Philadelphia, New York and Washington, according to the National Weather Service, which forecast "havoc" for travelers along the east coast from the Carolinas up through New England.
A pedestrian uses an umbrella as as he walks in front of the White House in Washington, Wednesday, Nov. 26, 2014.
A mix of rain and snow is falling steadily around the Washington region as a winter weather advisory remains in effect on one of the busiest travel days of the year, and thousands of people attempt to reach their Thanksgiving destinations.
Credit: Pablo Martinez Monsivais/AP
A woman walks over a road covered in slush, Wednesday, Nov. 26, 2014, in Newark, N.J.
The northern New Jersey region is expected to be hit by a snow storm, which will cause problems for those traveling ahead of the Thanksgiving Day holiday.
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Thanksgiving holiday travelers wait for departure announcements at Penn Station, Wednesday, Nov. 26, 2014, in New York.
Credit: Julie Jacobson/AP
Passengers wait to board an Acela train at South Station in Boston, Wednesday, Nov. 26, 2014.
Credit: Michael Dwyer/AP
People walk past a sign board that announces cancelled flights at LaGuardia airport on the day before Thanksgiving, in New York November 26, 2014.
More than 800 flights into and around the U.S. were canceled on Wednesday, while more than 1,000 were delayed, according to tracking website FlightAware.com.
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A person brushes off accumulated snow from the windshield of a vehicle, Wednesday, Nov. 26, 2014, in Newark, N.J.
Credit: Julio Cortez/AP
People walk through falling snow at a rest stop on Interstate 95 Wednesday, Nov. 26, 2014, outside Baltimore, in Aberdeen, Md.
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Vehicles cruise under light snowfall, Wednesday, Nov. 26, 2014, in Newark, N.J.
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Vehicles enter the Holland Tunnel on November 26, 2014 in New York City.
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The price of super unleaded fuel is shown at a gas station in Gretna, Neb., Tuesday, Nov. 25, 2014.
The cheapest gas in half a decade is expected to entice more Americans to pile into cars, trucks and vans for their Thanksgiving journeys.
Credit: Nati Harnik/AP
Passengers wait to board trains at South Station in Boston, Wednesday, Nov. 26, 2014, a day before Thanksgiving.