Jet Fuel Is Just Kerosene - So Why Is Its Price So Hard to Hedge?

Walk into a refinery and jet fuel looks almost boring. It is kerosene: a middle-distillate cut a notch lighter than diesel, chemically close enough that the same crude barrel yields both from adjacent trays of the same distillation column. You would expect the price to behave itself. It does not. The molecule is simple; the market around it is a mess. There is no deep, liquid, exchange-traded jet fuel futures contract for an airline to lean on, so carriers hedge the single largest variable cost in their business with instruments built for something else. That gap between what they burn and what they trade has a name, and it has cost airlines real money.

No contract for the thing you actually buy

Crude has Brent and WTI. Diesel has ICE gasoil and NYMEX ULSD, the contract most people still call heating oil out of habit. Gasoline has RBOB. Jet fuel has swaps and some regional paper, but nothing with the volume and open interest a hedger needs to move size without paying up. An academic review of U.S. passenger carriers put it plainly: for most of 1994 to 2014 there were simply no exchange-traded jet fuel contracts to use. Jet swaps exist and give you the cleanest match to your exposure, but they are expensive and illiquid, which is another way of saying you pay a premium and you may not find a counterparty when you need one.

So airlines cross-hedge. They buy a correlated product and hope the correlation holds. The usual candidates are WTI, Brent, and heating oil, and the research consensus is that heating oil is the best of them. That makes sense at the molecule level: heating oil and jet are both middle distillates off the same part of the barrel, so their prices move together far more tightly than crude and jet do. Heating oil is the proxy of choice not because it is perfect, but because everything else is worse.

How good is "good enough"

Here is the number that should keep a treasury desk honest. In the same study, heating oil's hedge effectiveness topped out around 66 to 67 percent on one- and three-month horizons, with the three-month contract the sweet spot at roughly 66.5 percent. WTI came in lower, in the high-40s to mid-50s. Push the hedge out to twelve months and heating oil's effectiveness fell to the high-50s. Read that again: your best available hedge explains about two-thirds of the variance in what you are trying to protect, and it decays the further out you go.

The other third is basis risk. The basis is the difference between the price of your hedge and the price of the thing you actually consume. For a direct hedge that gap is small and mostly seasonal. For a cross hedge it is structural, and it widens with time because the correlation between two different products is not a law of nature. It drifts. Southwest, one of the more sophisticated hedgers in the business, said as much when it noted that the link between WTI and jet fuel had not held up in recent periods the way it had historically. When the correlation you underwrote your whole program on starts sliding, the protection you paid for thins out at exactly the moment you need it.

The day the spread blew out

Basis risk is an abstraction until a crack spread detonates. 2022 was the detonation. As aviation demand snapped back after the pandemic and refining capacity stayed tight, jet fuel decoupled from crude and ran to roughly 40 percent above Brent. The European gasoil crack briefly cleared 80 dollars a barrel, the highest on record, against a more typical band of 20 to 40. Now picture the airline that hedged its jet exposure with a crude contract. Crude went up, so the hedge paid something. But jet ran far harder than crude, so the payout covered only part of the bill. The hedge softened the blow and then handed the carrier the rest of the increase anyway. That residual is basis risk in cash terms.

This is not a hypothetical failure mode. Delta bought the Trainer refinery near Philadelphia in 2012 for about 150 million dollars precisely because crude hedges leave the crude-to-jet spread exposed. The logic, in the words of the deal's defenders, was that if you hedge on crude and jet blows out against crude, your crude hedge cannot soften the blow. Owning the refinery turned the crack spread from a risk into an asset Delta controlled. By 2022, with cracks at extremes, that once-mocked purchase was throwing off a benefit the airline measured in tens of cents per gallon.

Same barrel, different behavior

The temptation is to treat jet and diesel as interchangeable and hedge jet with diesel's liquid contracts. Chemically you can almost get away with it. Commercially you cannot, because the two cracks diverge for reasons that have nothing to do with the molecule. Jet and diesel compete for the same middle-distillate output inside a refinery. When jet demand surges, refiners tilt the barrel toward kerosene, which pulls supply away from diesel, and the two spreads pull apart. Jet also carries demand drivers diesel does not: air travel is seasonal and shock-prone in ways trucking and heating are not, and jet has no winter heating pull to muddy the picture. So a diesel or gasoil hedge tracks jet nicely in calm markets and then parts company in a demand shock, which is the only time the hedge earns its keep.

Crack spreads have stayed elevated since 2022 even as crude eased, which points at something structural rather than a one-off. Refining capacity for aviation-grade fuel has not kept pace, and every distillate hedge an airline holds is quietly short that structural tightness.

What hedgers actually do about it

There is no clean fix, only trade-offs a treasurer picks between. Buy jet swaps and accept illiquidity and cost for a tighter match. Cross-hedge with heating oil and accept a third of your exposure sitting in the basis. Shorten the hedge horizon toward that three-month sweet spot, where effectiveness is highest and correlation has less time to drift, and give up longer-dated cover. Or go the way Delta did and take physical control of a piece of the supply chain, which converts basis risk into an operating business with its own headaches and capital needs.

The through-line is that jet fuel is easy to make and hard to price-protect. The simplicity of the molecule is exactly what denies it a market deep enough to hedge cleanly, because refiners and traders can move the same barrel into diesel and never need a dedicated jet contract to do it. Airlines have learned this the expensive way, in Japan Airlines' hedging losses before its 2010 bankruptcy and in every quarter a crude hedge underdelivered against a jet bill. The lesson is not that hedging fails. It is that a proxy is a promise the market is under no obligation to keep, and the one time it breaks that promise is the one time you were counting on it.