American and United both used Wall Street's favorite September ritual, Morgan Stanley's Laguna Conference, to warn investors that a fresh spike in jet fuel prices could force real capacity cuts as soon as December, with more likely in early 2027. Translation for the rest of us: the airlines are telling money managers they'd rather fly a little less than eat the fuel bill, and "fly a little less" during the exact stretch when you're trying to book Thanksgiving and Christmas award seats is not a coincidence you want to ignore.

What they actually said

Speaking at Morgan Stanley's 14th Annual Laguna Conference on September 16, American CEO Robert Isom and CFO Devon May said fourth-quarter fuel prices have come in about $1 per gallon above what the airline had guided to back in July, adding roughly $1 billion in unplanned costs for the quarter alone. Every additional penny per gallon costs American about $10 million a quarter. Management said American will make "tactical schedule changes" in December if fuel stays elevated, and that 2027 capacity growth is now likely to come in lower than 2026 because of it.

United's CFO Mike Leskinen delivered the same message in his own remarks: the airline is "not flying to maximize market share," it's flying to maximize profitability, and if the math on a route doesn't work with fuel this expensive, the flying gets cut. United has already confirmed some December flight cancellations are coming, with more possible early next year.

Why fuel is spiking again

Both airlines pointed to the same culprit: fallout from the Iran war has pushed crude prices up, and the crack spread — the gap between crude oil and the actual refined jet fuel airlines burn — has roughly tripled versus historical norms. That second part matters, because it means airlines are getting squeezed even harder than a plain oil-price chart would suggest. American now expects its full-year fuel bill to run several billion dollars ahead of last year's.

What this means if you're sitting on points

Airlines don't cut capacity evenly. The routes that get trimmed first are the marginal, low-demand ones — off-peak weekday flights, secondary international routes, thinner leisure markets — while the routes everyone actually wants to fly around the holidays stay full or get more expensive. Fewer total seats in the system during peak travel weeks historically means two things for points-and-miles players: cash fares creep up because there's less competition for the seats that remain, and award availability gets tighter because airlines have less excess inventory to release at saver levels in the first place. If you've been sitting on a pile of AAdvantage or MileagePlus miles waiting to book Thanksgiving or Christmas, this is a real reason to stop waiting and start searching now rather than in November.

The catch: "tactical" is doing a lot of work

Notice both airlines are using soft language — "tactical schedule changes," not "capacity cuts." That's partly genuine uncertainty about where fuel prices land by December, and partly investor-relations hedging so nobody has to walk back a specific number later. Airlines have used fuel spikes to justify fare hikes and fee increases before without ever fully reversing them once fuel came back down, so don't expect this to unwind cleanly even if oil prices cool off. The people who benefit here are the ones who book before the schedule actually shrinks, not after.

Confirmed directly from remarks by American Airlines CEO Robert Isom and CFO Devon May, and United Airlines CFO Mike Leskinen, at Morgan Stanley's 14th Annual Laguna Conference on September 16, 2026; United's own investor relations newsroom confirmed the presentation and participants in advance.