Core Viewpoint - Frontier Airlines CEO Barry Biffle challenges United Airlines CEO Scott Kirby's assertion that the deep discount model in the U.S. airline industry is dead, emphasizing the oversupply issue in the market [1][2]. Group 1: Industry Dynamics - Biffle argues that there is a flight oversupply issue in the United States, countering Kirby's claims about the viability of discount airlines [2]. - Kirby predicts that Spirit Airlines, the largest U.S. discounter, will go out of business, citing its recent bankruptcy as evidence of financial instability [2][3]. - Kirby's comments suggest a competitive landscape where discount carriers may struggle to survive, with Biffle positioned as a potential leader among them [3].