Concentrating sustainable aviation fuel supply at a small number of major airports would deliver outsized climate and health benefits compared with spreading the fuel thinly across the system, according to a new analysis from the Clean Air Task Force (CATF).

The finding reframes a persistent debate in decarbonising aviation: with SAF production still scarce and expensive, where should the limited volumes go? CATF's answer is concentration. A handful of large hub airports, the analysis argues, offers the highest return in avoided emissions and reduced local air-quality impact per gallon deployed.

The logic carries direct implications for airlines, fuel suppliers and airport operators. Airlines with dense operations at large hubs — the carriers most exposed to emissions accounting under CORSIA and regional mandates — would capture the bulk of the benefit if scarce SAF volumes are routed to those points rather than distributed network-wide.

What does targeted SAF deployment change?

The analysis positions airport-level targeting as a strategy question, not merely a logistics one. Key consequences flow from it:

• Airlines concentrating SAF offtake at specific hubs could claim larger, more verifiable emissions reductions per unit of fuel than under fragmented book-and-claim arrangements.
• Airport operators at selected hubs gain leverage to negotiate supply agreements and invest in blending and storage infrastructure with predictable demand behind it.
• Producers get larger, more creditworthy counterparties at concentrated demand points, which CATF argues strengthens the investment case for new capacity.
• Communities around major airports — where aircraft emissions contribute to local air-quality burdens — stand to gain health benefits that broad, diluted deployment would not deliver.

Why concentration beats dispersion

SAF remains a constrained commodity. Global production covers a small fraction of jet fuel demand, and mandates in the European Union and United Kingdom, plus incentive schemes in the United States, are pulling scarce volumes toward competing buyers. In that environment, CATF's analysis concludes, the marginal climate value of each gallon depends heavily on where it is burned and how it is accounted for.

Large hub airports concentrate three things at once: high traffic volumes, high per-aircraft fuel uplift, and dense surrounding populations affected by non-CO2 emissions. Targeting those points, the analysis finds, multiplies both the climate and health payoff of the same limited fuel volume.

What are the open questions?

The analysis is a strategic argument, not a mandate. Turning targeted deployment into practice requires airlines, lessors and fuel suppliers to align offtake structures around specific hubs — a commercial coordination problem the industry has so far solved only partially through book-and-claim systems.

Regulators will also need to decide whether targeting guidance belongs in mandate design, airport concession frameworks, or emissions accounting rules. CATF's analysis gives policymakers a quantitative case for favouring concentrated deployment, but implementation details — which airports, which volumes, on what timeline — remain open.

For network planners and fuel procurement teams, the message is that SAF strategy may increasingly be a hub-by-hub decision rather than a system-wide one. Whether concentration survives contact with competing airline interests at the same hubs will determine if CATF's framing shapes the next wave of SAF agreements.