Yesterday, the United States and U.S. Department of Transportation (DOT) disclosed a lawsuit against Southwest Airlines, accusing the airline of chronically delayed flights and interrupting passengers’ travels.

The Denver-based low-cost carrier said its combination with the Dania Beach, Florida-based Spirit would create a stronger low-cost carrier and benefit “from the very significant synergies Frontier expects to achieve by combining the airlines’ operations.”

Despite pressure to cut costs and an activist investor campaign, Southwest reported a healthy profit for the fourth quarter.

New flights have been added for Kansas City and Philly fans, with one airline adding flights on a route it doesn't normally serve.

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 Airlines and a fine against Frontier Airlines. The agency said the U.S ...

The Department of Transportation defines a flight to be chronically delayed if it is “flown at least 10 times a month and arrives more than 30 minutes late more than 50 percent of the time. Cancellations are included as delays within this calculation.”

American Airlines, Frontier Airlines, Southwest Airlines, United Airlines and Delta Air Lines have added a combined 31 new nonstop flights between Philadelphia International Airport (PHL ...

Air New Zealand, which flies one of the longest regularly scheduled routes on the entire planet, took the top award, handed out by AirlineRatings.com. The Kiwi carrier serves Auckland, New Zealand’s largest city, from New York’s JFK Airport — a distance of 8,828 miles. The trip takes 16 hours and 15 minutes.

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

Denver-based Frontier Airlines says it’s ready to keep talking after bankrupt Spirit Airlines rejected its offer to merge.