Spirit, which filed for bankruptcy protection last year, says it has rejected the new Frontier overture but would be open to a higher offer.

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

Southwest Airlines and Frontier Airlines are both facing legal actions by the Department of Transportation for operating flight schedules the government says were notoriously late. Frontier ...

The DOT also fined Frontier $650,000 for chronically delayed flights. The Department of Transportation on Wednesday sued Southwest Airlines, alleging the carrier operated chronically delayed ...

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 ...