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

Transportation Secretary Pete Buttigieg said airlines have a legal obligation to ensure that their schedules list realistic ...

The federal government is suing Southwest Airlines and fined Frontier Airlines, accusing the carriers of illegally operating ...

The Department of Transportation found that Southwest was responsible for 90% of the disruptions on two flights.

The U.S. Transportation Department has sued Southwest Airlines for violating rules about setting realistic flight schedules.