The Department of Transportation is investigating after thousands of canceled flights left holiday travelers stranded across the country.
RELATED: New York hit with deadly low temperatures and heavy snow
Many airlines were forced to cancel flights due to the weather, but Southwest was the most affected. About 4,000 domestic U.S. flights were cancelled Monday, according to the tracking website FlightAware, and 2,900 of those were Southwest's. Nearly 2,500 more flights had already been canceled as of 5 a.m. Tuesday and problems are likely to continue at least into Wednesday.
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