Major European carriers are preparing to push back against the EU’s synthetic aviation fuel mandate, arguing that the timetable is out of line with supply and could add substantial costs to tickets.
European airlines are preparing a challenge to the EU’s synthetic aviation fuel rules, opening a new dispute between the industry and Brussels over the pace and cost of aviation decarbonisation. The carriers plan to ask for a delay or repeal of the synthetic fuel requirement due to take effect from 2030.
At the centre of the dispute is the ReFuelEU Aviation regime. Under the European Commission’s published framework, aviation fuel supplied at EU airports must contain a 2 per cent share of sustainable aviation fuel from 2025, rising to 6 per cent in 2030. Within that, synthetic aviation fuels are required to account for 1.2 per cent from 2030, rising sharply in later decades.
The industry’s concern is not with the existence of decarbonisation targets as such, but with whether supply can be built quickly enough to meet the synthetic fuel sub-mandate without imposing heavy costs on passengers. The report said airlines believe there will be a major shortfall in eSAF production capacity by the end of the decade and that compliance could shift billions of euros in additional costs onto consumers.
The expected intervention is due from Airlines for Europe, the main industry body representing carriers including Lufthansa, Air France-KLM and IAG, owner of British Airways. The group is preparing a formal statement arguing that the current timetable is too ambitious and risks distorting the market while supply remains scarce and expensive.
That argument goes to the core of the EU’s wider green-industrial strategy. Brussels has presented ReFuelEU Aviation not only as a climate measure but also as a way to stimulate investment in low-carbon fuel production. The Commission’s transport department says the regulation is intended to increase both the supply and use of sustainable aviation fuels in the Union, while the Commission’s December 2025 announcement on an eSAF early movers coalition said the EU is home to more than 40 synthetic fuel projects awaiting final investment decisions.
The industry case is that mandates cannot create real supply at commercial scale on their own. Most sustainable aviation fuel available today is bio-based rather than synthetic, and true synthetic alternatives remain much more expensive and far less available. Environmental groups, by contrast, consider that weakening the timetable could cost Europe its lead in green aviation technology and undermine investment certainty.
For Brussels, that creates an increasingly familiar policy problem. Regulators want fixed targets to create investment signals. Airlines want flexibility until production capacity is demonstrably available. The tension has sharpened as the sector also deals with wider cost pressures from fuel markets and geopolitical instability. Those broader pressures are part of the industry backdrop to the planned challenge.
For EU policymakers, the question now is whether the synthetic fuel target remains politically and commercially sustainable in its current form. The legal framework is already in place, but the coming debate will test whether the Commission prioritises industrial certainty for fuel producers or cost realism for airlines and passengers.
