DOT investigating Southwest Airlines' holiday travel meltdown

The Department of Transportation is investigating whether Southwest Airlines sold more flights than it could manage during its operational meltdown last month. Read more: https://www.fox4news.com/news/us-investigating-december-flight-cancellations-at-southwest Subscribe to FOX 4: https://www.youtube.com/fox4news?sub_confirmation=1 Dallas news, weather, sports and traffic from KDFW FOX 4, serving Dallas-Fort Worth, North Texas and the state of Texas. Watch FOX 4 Live: https://www.fox4news.com/live Download the FOX 4 News App: https://www.fox4news.com/apps Download the FOX 4 WAPP: https://www.fox4news.com/apps Follow FOX 4 on Facebook: https://www.facebook.com/Fox4DFW/ Follow FOX 4 on Twitter: https://twitter.com/FOX4 Follow FOX 4 on Instagram: https://www.instagram.com/fox4news/ Subscribe to the FOX 4 newsletter: https://www.fox4news.com/newsletters