The lawsuit alleges Southwest illegally operated chronically delayed flights and disrupted passengers' travel plans.

Having assessed a first-of-its-kind fine for “chronic flight delays” against JetBlue Airways, federal regulators have now moved to penalize both Southwest Airlines and Frontier Airlines for similar ...

The DOT's moves come weeks after issuing a multi-million dollar fine against JetBlue.

The Transportation Department is stepping up enforcement of persistent flight delays with a lawsuit against Southwest ...

The US Department of Transportation sued Southwest Airlines and fined Frontier Airlines for flight delays, seeking civil ...

The U.S. Transportation Department is suing Southwest Airlines and has fined Frontier Airlines over "chronically" delayed ...

Southwest Airlines is being sued and Frontier Airlines fined over chronic flight delays by the Department of Transportation, ...

The Department of Transportation said that two Southwest Airlines routes arrived late nearly 180 times in a five-month period ...

The U.S. Department of Transportation has sued Southwest Airlines and fined Frontier Airlines for "chronically delayed flights," the agency announced Wednesday. The moves come after DOT fined JetBlue ...

The DOT filed a lawsuit against Southwest Airlines, citing a pattern of chronic delays, as the government pushes for stricter ...

A lawsuit filed against Southwest alleges the airline operated multiple “chronically delayed” flights affecting thousands of ...