US budget airline model runs out of runway as Spirit goes bankrupt
Spirit Airlines's bankruptcy filing landed in the same week United and Delta posted record profits. CNBC writes that in the US airline industry low fares are no longer enough on their own, and the issue is product mix rather than jet-fuel shocks.

Spirit Airlines's filing for Chapter 11 protection has reopened the debate on the limits of the US low-cost airline model. In the same quarter that United and Delta posted record profits, carriers competing solely on ticket price have logged successive losses.
According to CNBC, the root cause is not jet-fuel volatility but a shift in the passenger mix. Post-pandemic demand has concentrated in premium economy and business travel. United and Delta extract high margins from this segment through loyalty programmes and long-haul networks, while Spirit, Frontier and JetBlue fight over a shrinking budget pool.
Spirit's bankruptcy follows a federal court's decision to block its merger with JetBlue. Industry analysts expect further consolidation pressure on other low-cost carriers. Investor focus is now on how the « unbundling » model — charging for bags, seat choice and onboard service — will evolve as the survivors raise base fares to fund product upgrades.
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