ICAO Pushes Back as EU Proposes Expanding Its Emissions Trading System to Aviation

The International Civil Aviation Organization has issued a statement on the same day the European Commission tabled its proposed revision of the EU Emissions Trading System (ETS), specifically addressing the Commission's plan to expand ETS coverage for aviation from 2029. ICAO's statement raises concern that the expansion would introduce duplicative carbon pricing alongside CORSIA, the global market-based measure for international aviation emissions that ICAO administers and that the EU itself helped negotiate in 2016.

What the Commission Actually Proposed

The Commission's 17 July proposal would extend EU ETS coverage to flights departing the EEA bound for third countries within 5,000 kilometers of the EU's geographic center, stopping short of transatlantic and other long-haul routes, effective 2029. The Commission states the proposal maintains close alignment with CORSIA by continuing to implement it in EU law through 2035 and introducing a deduction mechanism intended to prevent double carbon pricing where both systems would otherwise apply to the same flight. The proposal sits within a much larger ETS revision covering industrial decarbonization financing, a new Industrial Decarbonization Bank, and expanded coverage for maritime transport and waste incineration, and will need approval from the European Parliament and Council, with implementation targeted for 2028.

The Core of ICAO's Concern

ICAO's position rests on CORSIA's status as the only globally harmonized measure for international aviation CO2, agreed by consensus among ICAO's member states specifically to avoid a patchwork of national and regional schemes. From that vantage point, any regional expansion, even one designed with an offset mechanism, risks setting a precedent that other jurisdictions could follow with their own regional schemes, which is the fragmentation ICAO's statement references. ICAO also notes that its 2025 Assembly reinforced member states' mandate for it to advance CORSIA specifically, which frames the EU's move as running against a recent, collectively agreed direction rather than an isolated disagreement.

Reading the Deduction Mechanism as the Actual Point of Contention

The technical crux is whether the Commission's proposed deduction mechanism genuinely avoids double pricing in practice, or only avoids it on paper while still creating two overlapping compliance regimes an airline must navigate. The Commission's own language describes the mechanism as avoiding double carbon pricing while continuing to support the development of an effective global approach; ICAO's statement describes the same proposal as introducing the potential for double charging. Both statements can be technically accurate simultaneously, since the disagreement is less about whether a deduction exists than about whether coexistence of two overlapping systems, even with an offset, undermines the singular, harmonized nature CORSIA was designed to have.

Why This Matters for SAF and Broader Fuel Policy

The Commission's proposal explicitly links the ETS expansion to reinforced support for SAF uptake, cleaner propulsion and hydrogen, meaning the outcome of this dispute has direct bearing on how aviation fuel transition incentives are funded and structured in the EU specifically, separate from whatever CORSIA does globally. How this is resolved between the Commission, Parliament, Council and ICAO's member states over the coming legislative process will shape whether SAF producers and airlines serving European routes face one harmonized global compliance framework or two parallel ones with a reconciliation mechanism between them.

Source: ICAO, 17 July 2026.