The U.S. Department of Transportation announced it would examine Southwest Airlines’s customer service policies after the airline was crippled with widespread disruptions on Monday, noting the agency was “concerned” by the “disproportionate and unacceptable rate” of cancellations and delays.

More than 3,900 flights within, into, or out of the United States were canceled on Monday and another 7,582 were delayed as of 8:45 p.m., according to tracker Flight Aware.
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