Transportation Department to review Southwest's mass flight cancellations
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Thousands more flights were canceled on Monday as the effects of winter storms and operational challenges continued to impact holiday travel.
The big picture: The Department of Transportation tweeted that it would look into the actions of Southwest, which accounted for a large amount of the more than 3,900 flight cancelations and 8,200-plus delays within, into or out of the U.S. as of late Monday, per FlightAware data.