The Department of Transport (DoT) has announced a lawsuit against Southwest airlines for “for illegally operating multiple chronically delayed flights and disrupting passengers’ travel”. The DoT also announced that Frontier Airlines would be fined $650,000 ($325,000 to be paid to the U.S. Treasury and the remaining $325,000 to be suspended if the carrier does not operate any chronically delayed flights in the next three years).
The DoT considers a flight to be chronically delayed if it is flown at least 10 times per month and arrives more than 30 minutes later more than 50% of the time. The full court filing can be found here.