Delta is quietly an oil company, and that is how it is surviving $100 oil

On 9 October Delta Air Lines told investors something that should not add up. Fuel cost it $1.6 billion more in the three months to September than a year earlier. It paid $3.61 a gallon, against $2.25 a year before. And yet its pre-tax profit, $1.5 billion, was the same as last year.

"We expect to generate a pre-tax profit of roughly $4.5 billion, absorbing a $6 billion increase in fuel costs." Ed Bastian, Delta CEO, 9 October 2026

That is not because the quarter went to plan. Delta had guided to fuel at $3.15 a gallon and an operating margin of 11% to 13%. It got 9.4%, and earnings per share of $1.72 fell short of both its own range and analysts' forecasts. For the full year it now expects earnings of $5.10 to $5.60 a share, down from the $6.50 to $7.50 it promised in January.

So the oil shock is hurting Delta. The surprise is how little. Its own filings and this week's results show why: Delta is not only an airline. It owns an oil refinery, it runs what amounts to a credit-card business with American Express, and it sells a product that customers are still paying up for.

The bill nobody planned for

Fuel is the cost airlines cannot control. Since the Gulf disruption began, Brent crude averaged $114 a barrel in September, peaking at $131 on 15 September, according to the US Energy Information Administration. Jet fuel has done worse than crude, because refineries cannot make enough of it. IATA expects jet fuel to average $152 a barrel this year, up 69% from $90 in 2025.

For Delta that means a fuel bill about $6 billion, or roughly 60%, higher in 2026 than in 2025. It expects to pay $4.25 a gallon in the last three months of the year. In the first half of 2026 fuel was already 21% of its operating costs, and its June filing shows purchase prices up 80% on a year earlier.

The refinery in Pennsylvania

In 2012 Delta did something no other big airline had done. It bought the Trainer refinery near Philadelphia from Phillips 66 for $150 million and put it in a subsidiary, Monroe Energy. The refinery supplies Delta's operations in the northeast and its New York hubs.

Owning a refinery does not protect Delta from the price of crude. What it captures is the refining margin, the gap between crude and the jet fuel made from it. That gap is what has exploded this year. IATA puts the 2026 jet fuel crack spread at $57 a barrel, a historic high.

The payoff shows in the numbers. The refinery benefit was 1 cent a gallon in 2024 and 4 cents in 2025, when margins were thin. It was 13 cents in the third quarter of 2026, and Delta expects about 40 cents in the fourth, more than $700 million over the year. In the June quarter alone Monroe earned $351 million of operating income, despite a temporary outage.

A hedge, not a shield

It would be easy to overstate this. Even 40 cents a gallon covers only a slice of a fuel price that has risen by about two dollars. On the numbers Delta gave this week, the refinery offset roughly a tenth of the third quarter's increase. It also carries its own risks: an outage in the spring cut its contribution, and Monroe buys most of its renewable fuel credits in the open market.

Its value is that it pays most exactly when airlines suffer most. The last time refining margins spiked, in 2022, the benefit reached 23 cents a gallon. Most US airlines no longer buy financial fuel hedges. Delta owns a physical one.

Customers are paying for it

The bigger offset is pricing. In the June quarter Delta's domestic passenger revenue rose 15% while its capacity grew just 2%. In September total revenue rose about 16% on flat capacity, and unit revenue was up 15.4%. For the last three months of the year Delta expects revenue up about 20% on capacity up about 3%, with fewer economy seats than a year ago.

Premium cabins and loyalty revenue each grew nearly 20% in the third quarter. Competitors have cut flying to protect their own margins, which leaves Delta room to raise fares. Forward cash sales grew nearly 20%, the fastest since 2022, and more than 60% of fourth-quarter revenue was already booked.

Rivals without the cushions

The difference shows when the big four US carriers sit side by side. In the June quarter Delta's operating margin was 9.4%. United's was 6.2%, Southwest's 3.4% and American's 2.7%. United expects to recover all of its fuel increase through fares by the fourth quarter, but it had recovered only about half in the second.

Ed Bastian put the gap more bluntly this week: Delta's return on invested capital is about 11%, he said, against around 3% for the rest of the domestic industry. Across the world IATA expects airline profits to halve this year, to a net margin of 2%.

The credit card that flies

The third cushion has nothing to do with planes. American Express pays Delta for SkyMiles cards, and those payments reached $4.5 billion in the first half of 2026, up 13%. Delta expects more than $9 billion for the year, on the way to $10 billion, up from $8.2 billion in 2025. Card sign-ups and spending both grew by double digits last quarter.

Card payments do not depend on the price of jet fuel. They depend on Americans spending on their cards. That makes them a steady income stream that a pure airline does not have, and it is why 61% of Delta's revenue now comes from outside the main cabin ticket.

Our call

Delta will hit its December-quarter target of about $1.2 billion in pre-tax profit, reported in mid-January 2027, and end 2026 with roughly $4.5 billion. We put that at about two chances in three.

The case rests on things already in hand. More than 60% of the quarter's revenue is booked. The refinery benefit Delta is counting on is tied to refining margins that the EIA expects to stay tight, with Brent forecast at $105 in the fourth quarter. And the guidance already assumes fuel at $4.25 a gallon, well above the third quarter's $3.61. Our record is consistent with this: in our Saudi Arabia study we argued that Gulf barrels would come back slowly, which is the world this guidance is built for.

The main way this fails is that fuel beats the forecast again. Delta missed its third-quarter fuel guidance by more than $500 million, and another pipeline attack could do the same in December. We give a fuel overshoot that pushes the quarter below $1.2 billion about a one-in-four chance. The smaller risk is demand: if high fares finally push premium and corporate travellers away, the revenue engine stalls. We put that near 10%, because nothing in the bookings yet points that way.

What to watch

• Mid-October: United and American results. If rivals still cannot pass fuel through to fares, Delta's pricing power is real. If they can, the gap narrows.
• Early November: the EIA's next oil outlook. A Brent forecast well above $105 for the quarter would put Delta's $4.25 fuel guidance at risk.
• Through the quarter: refining margins and Trainer outages. The 40-cent refinery benefit needs the refinery running and margins staying wide.
• Mid-January 2027: Delta's fourth-quarter results. Pre-tax profit against the $1.2 billion target, Amex payments against $9 billion, and the 2027 outlook.

The lesson

In a commodity shock, the companies that survive best are the ones that own a piece of the thing that is getting scarce. Delta's refinery looked like a curiosity for a decade, earning a cent a gallon in 2024. In 2026 it is part of why Delta can absorb a $6 billion fuel bill and still earn roughly what it did last year.