What ten cents of jet fuel does to an airline's earnings: Delta before Friday

Delta Air Lines reports its third quarter on Friday 9 October before the US open. The number most investors will look at first is earnings per share. The number that decides it is the price Delta paid for jet fuel, and that price has been moving all quarter.

How big the fuel line is

Delta burns about four billion gallons of jet fuel a year. At that scale, a change of ten cents a gallon is worth roughly four hundred million dollars a year, before any hedging or surcharges. For the third quarter, Delta guided to an average fuel price of about three dollars and fifteen cents a gallon. In the second quarter, according to the preview we used, adjusted fuel expense was about four point four billion dollars, up seventy seven percent from a year earlier. We did not re check that figure against Delta's own release, so treat it as a secondary source number.

What oil did during the quarter

Brent traded above one hundred dollars a barrel for part of the quarter and reached about one hundred and eight dollars in late September. On 6 October it settled at ninety eight dollars and sixty seven cents, down one point six percent on the day, after the G7 agreed to release one hundred million barrels over four months with a front loaded diesel component. West Texas Intermediate settled at eighty seven dollars and seventy seven cents. Jet fuel is refined from crude, so a lower crude price usually feeds through with a lag of weeks, which means the quarter Delta is about to report was priced mostly before the release.

What the street expects

The surveys do not agree. One consensus puts third quarter earnings at one dollar and eighty eight cents a share; another, from twenty analysts, averages two dollars and twenty three cents. Revenue consensus sits near seventeen point six billion dollars. Delta's own guidance from July was two dollars to two dollars and fifty cents a share with an operating margin of eleven to thirteen percent, and six dollars and fifty cents to seven dollars and fifty cents for the full year. The spread between the two consensus figures is itself a tell: the analysts who updated for the fuel move sit lower.

Why fuel hits earnings before it hits fares

An airline's revenue is set months ahead, when tickets are purchased. Its fuel cost is set when the fuel is purchased, which is closer to the flight. When fuel rises between the sale and the flight, the margin on that seat shrinks and the airline cannot do much about it until the next pricing cycle. That is why fuel spikes hit reported earnings before they hit ticket prices. The reverse is also true: when crude falls after a spike, the relief arrives in the following quarter, not the current one. For Friday's report, the fuel that matters is what Delta paid in July, August and September.

What the options market has priced

The options market has priced an earnings move of about eight to nine percent in either direction, on a stock that opened the year at sixty nine dollars and forty two cents and traded near eighty four dollars in early October, a gain of about twenty one percent. Over the past four quarters Delta has beaten the earnings consensus by about eight percent on average. None of that is a forecast. It is the range the market is prepared for.

What to read in the release, in order

First, the actual average fuel price per gallon against the three fifteen guide. Second, the fourth quarter fuel guide, because that is where the October crude drop should show up. Third, unit revenue, the revenue per available seat mile, which tells you whether higher fares offset the fuel bill. Fourth, any change to the full year range. A beat on earnings with a higher fourth quarter fuel guide and a lower full year range would be a weaker report than the headline suggests. A miss with a lower fuel guide could be the opposite.

The same arithmetic for the other carriers

The other US airlines report in the following weeks. Each has a different fuel share of costs, a different hedging policy and a different mix of long haul flying, so ten cents a gallon does not mean the same dollar figure for every one of them. The useful habit is to find the gallons number in each company's filing and do the multiplication yourself.

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Information and analytics only, not investment advice.

Sources

Options Trading Report, 4 October 2026
MarketBeat (report date)
TheStreet, 6 October 2026 (oil settlement)

Published on 7 October 2026.