United Airlines CEO Scott Kirby predicts that Spirit Airlines is doomed, criticizing its ultra-low-cost business model as unsustainable. In a brief 35-second video, he bluntly states that Spirit Airlines is "going out of business," highlighting challenges faced by ultra-low-cost carriers in the current aviation market. The video features striking visuals and is part of a recent news update. This warning underscores the uncertain future for budget airlines and the competitive nature of the airline industry.