Jet fuel is the expense that keeps airline CFOs up at night. Not because it is unpredictable in normal times — it is — but because it is the one major cost line they genuinely cannot control. Labour contracts can be negotiated. Aircraft can be deferred. Routes can be cut. But if fuel doubles, there is no operational lever that fully offsets it. You either pass the cost on to passengers, absorb a hit to margins, or both.
Right now, fuel has not doubled. But it has risen more than 60% in six weeks, and the trajectory is uncertain. That is enough to reshape how every airline in the world is thinking about 2026.
How a Fuel Spike Moves Through the Aviation Industry
Jet fuel is priced as a derivative of crude oil, but it trades at a premium because it requires additional refining steps and because demand for it is almost perfectly inelastic in the short run. You cannot run a flight on a different fuel, and you cannot hold a plane on the ground indefinitely without losing revenue. As Rick Joswick at S&P Global Energy put it: "Demand for jet fuel is inelastic. You cannot shortchange an airport."
Why This Spike Is Harder to Manage Than a Gradual Increase
The current price surge has a particular character that makes it harder to manage than a gradual oil price increase. It has been sudden, it coincides with closed airspace in one of the world's most important aviation regions, and it has arrived at the beginning of a spring travel season that was already fully booked. Airlines cannot retroactively reprice tickets they sold three months ago at $75 oil. Those flights will operate at a loss on the fuel line. The pricing response only takes effect for tickets sold from now forward.
That is why Jefferies analyst Sheila Kahyaoglu described the next 30 to 90 days as the "most acute" period for financial impact. Airlines are sitting on forward bookings priced before the war and operating costs priced after it. The two will not converge until the booking cycle turns over.
The Surcharge Response: What Airlines Are Doing Now
The surcharge mechanism is the industry's primary short-term tool. Cathay Pacific doubled fuel surcharges almost immediately. Air New Zealand raised fares on domestic and long-haul routes. SAS implemented temporary price adjustments. Willie Walsh of IATA has put the likely ticket price increase at up to 9% across the board.
The Medium-Term Structural Shift
For the medium term, the question is structural. Airlines had been placing large orders for new, fuel-efficient aircraft — the Airbus A320neo family, the Boeing 737 MAX — precisely to reduce their vulnerability to fuel cost volatility. A sustained period of high fuel prices accelerates the retirement of older, less efficient jets and strengthens the business case for those orders. It also strengthens the case for sustainable aviation fuel investment, even though SAF remains expensive and limited in volume.
The Central Variable Investors Need to Watch
The broader market implication is this: aviation is a highly leveraged bet on fuel costs. When fuel is cheap, airline economics look attractive. When fuel is expensive, thin margins evaporate quickly. Right now, fuel is expensive — and nobody can tell you with confidence when that changes. For investors tracking the aerospace and aviation sector, that uncertainty is the central variable to watch in the months ahead.