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

Southwest is disappointed that DOT chose to file a lawsuit over two flights that occurred more than two years ago," a spokesperson for the airline said.

The flights operated between Chicago Midway International Airport and Oakland, California ... announced an enforcement action against Frontier Airlines for chronically delayed flights.

Southwest Airlines was sued in federal court by the Department of Transportation, while Frontier was hit with a $650,000 fine.

DOT sues Southwest Airlines, accusing the airline of chronic flight delays while citing unrealistic scheduling that disrupted passengers.

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

The US Department of Transportation sued Southwest Airlines and fined Frontier Airlines for flight delays, seeking civil penalties against Southwest and imposing a $650,000 fine on Frontier, part of a broader crackdown on airline delay issues.

The lawsuit filed in California alleges that Southwest illegally operated chronically delayed flights and disrupted passengers’ travel plans.

The agency said the U.S. District Court lawsuit it filed in California on Wednesday alleges ... The department fined Frontier Airlines $650,000 in civil penalties, with $325,000 to be paid to ...

The agency said the U.S. District Court lawsuit it filed in California on Wednesday alleges ... The department fined Frontier Airlines $650,000 in civil penalties with $325,000 to be paid to ...

US Government Sues Southwest Airlines and Fines Frontier for Chronically Delayed ... The agency said the U.S. District Court lawsuit it filed in California on Wednesday alleges that Southwest ...

Delta Air Lines is dropping nonstop service to two Central American destinations from a key West Coast hub — but launching two new routes for the summer months.