NEW ORLEANS - The US Department of Transportation is now investigating Southwest Airlines after a strong of cancellations have left many stranded since Christmas weekend. The airline, is now apologizing to employees and customers for an "unacceptable" situation that left many at MSY stranded. 

As of this morning, only 6 out 43 flights remained scheduled, two of which, delayed. On a larger scale, the airline cancelled more than 2,600 hundred around the country as of Wednesday morning. 

The airline cites the winter storm that swept through the south over Christmas weekend as the reason for the cancellations. As of 8 a.m. Tuesday, only 5 flights through Southwest were on time, with 38 others canceled. 

As of 9 p.m. Eastern on Monday, more than 3,900 flights within, into, or out of the U.S. have been canceled, according to the tracking site FlightAware.

According to the Associated Press, the U.S. Department of Transportation is investigating the cancellations and the situation as a whole to see how to address the problem and if it could have been prevented.