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 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 ...

Airlines have a legal obligation to ensure that their flight schedules provide travelers with realistic departure and arrival times," Transportation Secretary Pete Buttigieg said in a statement.

Having assessed a first-of-its-kind fine for “chronic flight delays” against JetBlue Airways, federal regulators have now moved to penalize both Southwest Airlines and Frontier Airlines for similar infractions.

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

Frontier Airlines recently announced a discount promotion with 100 percent off of the base fares for selected February flights. Travelers are just responsible for paying the taxes and fees, and can enter the promotion code SAVENOW to score the savings.

Frontier Airlines’ second attempt at acquiring rival Spirit Airlines could impact not only one but two western Pennsylvania airports although the bankrupt air carrier said it preferred to emerge from bankruptcy protection as a standalone carrier.

Frontier Airlines is making a second attempt to merge with Spirit Airlines, which filed for bankruptcy in November amid financial struggles.

Frontier Airlines is attempting for a second time to merge with the now bankrupt Spirit Airlines, which declared bankruptcy late last year as budget airlines struggle.

Frontier and Spirit Airlines will once again try to merge, only months after the Biden administration won a key antitrust court battle to block

Spirit Airlines has rejected yet another takeover bid by discount carrier Frontier Airlines of Denver, saying its debtholders rejected the idea.