Low-cost air carrier Frontier Airlines is adding three new routes this spring, connecting more destinations across the U.S.

Twenty minutes into the flight from Denver to Houston, witnesses say the man was punching the seat in front of him.

Both Frontier and Spirit have been working to upend their business models that were marked by low fares and fees for add-ons from seat assignments to cabin baggage. The airlines last year did away ...

Frontier is making an offer to acquire the beleaguered Spirit Airlines, which filed for bankruptcy in November.

‍ DALLAS — Frontier Airlines (F9) wants to revive Spirit Airlines (NK), releasing another offer to merge with the ultra-low-cost carrier (ULCC) to establish a much stronger low-cost offering in the US ...

ISABEL. DEMOCRATS AND REPUBLICAN SENATORS ARE WORRIED THAT TWO AIRLINES, SPIRIT AND FRONTIER, MAY BE USING CUSTOMER DATA TO CHARGE SOME PEOPLE MORE FOR THE SAME SEATS ON THE SAME FLIGHTS.