The International Air Transport Association (IATA) announced at its World Sustainability Symposium that the International Civil Aviation Organisation (ICAO) has joined the Supporting Alliance for CORSIA EEU Supply (the Alliance).

The Alliance brings together more than 80 CORSIA stakeholders to address bottlenecks that limit the availability of Eligible Emissions Units (EEUs). Its work focuses on practical implementation support, including facilitating the processes needed to authorise emissions units for use under CORSIA while avoiding double counting.

This supports countries in navigating the interface between their Nationally Determined Contributions under the Paris Agreement and the requirements for authorising emissions units for use under CORSIA. It also helps countries access technical expertise and practical resources to participate effectively in carbon markets and implement Article 6.2 of the Paris Agreement.

While momentum is building in EEU issuance ahead of the 2027 CORSIA compliance deadline, significant work remains to ensure sufficient supply.

• As of August 2026, 42 CORSIA-compatible Letters of Authorisation covered 72 million EEUs, compared with 40 million at the start of the year.
• A substantial gap exists to cover the estimated 200-250 million EEUs required for the initial compliance cycle.

“The growth in EEU supply is encouraging, but the pace must accelerate. ICAO’s participation strengthens the cooperation needed among all stakeholders to unlock the needed supply. This is essential for CORSIA to deliver on its promise as it is the only globally agreed framework for addressing international air transport emissions,“ said Marie Owens Thomsen, IATA’s Senior Vice President Sustainability and Chief Economist.

“ICAO is working to ensure the successful implementation of CORSIA by governments, the aviation industry, and carbon market stakeholders. Through close collaboration, we are ensuring that sufficient CORSIA EEUs will be available, and our participation in the CORSIA Supporting Alliance will strengthen the pathway to carbon-neutral growth,” said Tetsuya Tanaka, Deputy Director, Environment at ICAO.