100 billion. That's how much the International Air Transport Association says higher jet fuel will shave from airline profits in 2026. Carriers have begun trimming loss-making routes and raising fares where demand allows, and investors have rewarded the best-positioned names: shares of Delta and United reached record highs in recent weeks and American Airlines shares hit an 18-month high. Airlines and hotels are stretching the traditional late-spring to late-summer season into a near year-round market, and Delta will report second-quarter results on Friday.

100 billion is the estimated drag on airline profits this year from higher jet fuel, the International Air Transport Association says. That figure is changing route and capacity decisions now: carriers are pruning unprofitable services and shifting seats to routes that carry more premium inventory.

What are airlines doing to protect margins? They're raising fares where demand is strong and cutting flights where yields are weak. Investors are signalling which strategies they prefer: Delta and United stock prices reached record highs in recent weeks, while American Airlines shares climbed to an 18-month high, evidence that markets favour carriers seen as able to absorb the fuel shock.

How are travel patterns changing and who's responding? The late-spring to late-summer European peak is blurring into a much longer season.

American has started New York to Edinburgh in March, United is running Newark to Palermo into December, and Delta extended Minneapolis to Rome into January, as carriers chase off-peak demand from travellers looking to avoid extreme heat, crowds and higher domestic costs.

Which parts of the travel economy are winning from the shift? Long-haul international flights carry a higher share of premium seats and therefore deliver stronger margins.

Airlines are adding premium inventory where demand supports it, and hotels and alternative accommodation providers report heavy bookings tied to festivals, sporting events and tournaments. Major host cities in North America and Europe have seen occupancy spikes linked to concentrated fan travel and extended visitor flows.

What wider forces are sending travellers abroad in the shoulder months? Record heat waves have closed attractions in some destinations and pushed travellers to change timing and choice of trip. Geopolitical disruptions are also redirecting flows toward markets perceived as safer, and event-driven demand is amplifying crowding and bookings beyond traditional peak windows. The OECD reported international tourist arrivals in OECD countries rose about 3.4 percent in 2025 to 847 million, even as arrivals to some markets, including Canada, remained below pre-pandemic levels.

How will this play out for consumers and markets next? Airlines are trying to capture higher-margin demand by expanding off-season schedules and premium cabins while passing some of the cost increases to travellers through higher fares. The industry’s near-term financial story will hinge on second-quarter earnings and management commentary; Delta begins the quarterly cycle when it reports this Friday.

Delta will report second-quarter results on Friday, the first of the major U.S. carriers to update investors on how the jet-fuel shock and the off-season travel boom are affecting profits and capacity choices. Originally reported by CNBC.