Sustainable aviation fuel has reached 2.8% of aviation fuel supplied in Europe, according to a report by Review Energy — the highest share the continent's airline industry has yet recorded and a marker of how quickly the blend rate has moved from demonstration-scale volumes toward a material slice of the jet fuel pool.

The figure matters because SAF remains the only near-term decarbonisation lever available to carriers that cannot otherwise electrify or hydrogen-power their fleets. A 2.8% supply share, while modest against total jet fuel consumption, represents a significant scaling of production and distribution infrastructure across European refiners, fuel suppliers and airports.

For airline finance departments, the number carries direct cost consequences. SAF currently trades at a substantial premium to conventional Jet A-1, and every percentage point of mandated blending flows into fuel bills — the largest single operating cost for most European network carriers. As the supply share grows, so does the exposure of ticket prices and margin structures to the green fuel premium, unless production costs fall.

The 2.8% share also signals where the bottleneck now sits. Aviation's decarbonisation targets depend less on aircraft technology in this decade — certified airframes and engines burning SAF blends are already in service across European fleets — and more on the pace at as which refinery capacity, feedstock supply and logistics chains can expand. Each new production facility that comes online translates directly into a higher blend rate, and into incremental emissions reductions across existing operations without waiting for fleet renewal cycles.

Airlines have positioned themselves accordingly, signing offtake agreements with producers and investing in supply projects to secure priority access to limited volumes. The competition for available SAF has effectively become a procurement race: carriers that lock in supply early insulate themselves from spot-market premiums, while those that rely on market purchases face the sharpest cost exposure as mandates tighten.

The production side of the equation remains the constraint to watch. Review Energy's reporting frames the 2.8% figure as evidence that SAF is "taking off" in Europe — but the blend rate still trails the trajectory that European policy and airline net-zero commitments imply for the second half of the decade. Scaling from under three percent toward double-digit shares will require a step change in refinery investment, feedstock availability and certification of novel production pathways.

What the 2.8% milestone establishes is that the supply curve is moving in the right direction, and at a pace that regulators, lessors and airline strategists will now measure against their own compliance timelines. Whether the next increments arrive on schedule depends on production capacity coming online faster than demand growth — the defining question for European aviation's fuel transition through the rest of the decade.