The response to that memo? According to a tweet to one stranded customer at Denver’s airport, which included that memo, 120 Southwest employees walked out.

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The U.S. Department of Transportation is investigating the mass cancelations and how Southwest handled stranding passengers across the country. The agency posted a tweet on its official account stating, “USDOT is concerned by Southwest’s unacceptable rate of cancellations and delays & reports of lack of prompt customer service. The Department will examine whether cancellations were controllable and if Southwest is complying with its customer service plan.” Southwest will likely be dealing with the repercussions of this meltdown into the new year.