Spirit Airlines on Tuesday rejected Frontier Group’s acquisition offer, worth about $2.16 billion, saying the bid from its fellow ultra-low-cost carrier was less beneficial to shareholders than its ...

United Airlines CEO Scott Kirby said struggling no-frills rivals such as Spirit and Frontier are on a path to “going out of business” because of their poor customer service. The outspoken Kirby called ...

Frontier Airlines is going after customers of Spirit Airlines, whose financial footing has gotten so shaky in recent weeks that it warned earlier this month it might not be able to survive another ...

Frontier Airlines announced 20 new routes on Tuesday from major metropolitan areas, with some fares as low as $29. The new domestic and international routes are launching from Houston, Detroit, Fort ...