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.”

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

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.”

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

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

The Potomac plane crash has had a cascading effect that will send ripples through the airline industry for days, if not longer. Here is everything to know.

Frontier Airlines is again pursuing a merger with Spirit Airlines, with Spirit mired in chapter 11 bankruptcy proceedings.

The South Florida-based budget airlines has rejected another one of Frontier's attempts to combine. Find out the details.

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.

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 ...

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 ...