JET FUEL & AIRLINES
Fuel is an airline's largest single market-priced cost — typically a fifth to a third of operating expense — and it prices off the distillate barrel. As of 2026-09-02, ULSD (the tradeable distillate print, jet fuel's closest public proxy) sits at $4.4641/gal — +18.4% over the past month, +88% over a year. A barrel of distillate currently earns $97.21 over a barrel of WTI — the refining premium airlines pay above crude itself.
The pass-through chain, step by step
Crude → distillate: jet fuel and diesel come off the same part of the barrel, so the distillate crack — not crude alone — is what airlines actually feel. In the 2026 blockade spike, distillate rose 72% while crude rose 63%: the product amplified the crude move. Distillate → airline cost: most carriers buy at spot plus location differentials; hedging is the exception in the US, so moves reach cost within weeks. Cost → fares and margins: fares follow with a lag measured in months (capacity and competition decide the split); the difference lands on margins first. That ordering — fuel now, fares later, margins in between — is why airline equities react to distillate faster than ticket prices do.
Method — honest proxies, stated
- The fuel print: CME ULSD futures (Heating Oil Oct 26), $/gal, daily settle. Jet fuel itself trades OTC and in weekly assessments (Gulf Coast spot, IATA's weekly monitor); ULSD is its liquid, free, same-barrel proxy — direction tracks, absolute level differs by a spread.
- The distillate crack: ULSD × 42 − WTI, both front-month, computed from the same session's settles.
- The equity side: airline shares trade the pass-through in real time — the sector's live coupling to Brent runs on the Transmission board (free for subscribers). This page prices fuel, not stocks, by design.
FAQ
Do falling oil prices mean cheaper flights? Eventually and partially. Fuel savings reach fares with a months-long lag, and only where competition forces it. What falls first is the airlines' cost line.
Why did fares stay high while oil fell this year? Because distillate fell slower than crude (the crack stayed wide), and because summer demand let carriers keep the difference. Watch the distillate print above, not the Brent headline.
Is jet fuel the same as diesel? Same barrel fraction, different spec. They price together closely enough that the free diesel print is the standard public proxy — which is exactly how we use it, and say so.