Cirium Flight Emissions Review

Transparent airline rankings report

VIEW THE REPORT

What’s included in the Cirium Flight Emissions Review:

Most improved global airlines from 2019 to 2024, recognizing those that achieved the greatest reduction in emissions per passenger kilometer.
Top-performing airlines by stage length 2023-2024, based on emissions efficiency by short, medium and long haul flight sectors.
Intra-regional and trans-oceanic trends 2023-2024, offering insight into howgeography, aircraft type, and operationalfactors shape performance outcomes.

“This is more than a ranking. The Cirium Flight Emissions Performance Review is designed to support smarter planning, foster collaboration, and help aviation move further and faster towards its sustainability ambitions.”

Jeremy Bowen
CEO, Cirium

Top Performers

Download the Cirium Flight Emissions Review

DOWNLOAD NOW

SUBSCRIBE TO BE THE FIRST TO HEAR ABOUT NEW CIRIUM REPORTS AND ANALYSES.

Building Confidence in Emissions Data

Independent, verified and trusted flight emissions data to aviation stakeholders.

EmeraldSky, the most accurate methodology for fuel burn and CO2 emissions, audited by EY and accredited by the Rocky Mountain Institute (RMI) as a qualified data provider to the Pegasus Guidelines. EmeraldSky achieves an independently calculated unrivalled >99% accuracy on emissions. Collaborate with Cirium, a leading data member of Impact on Sustainable Aviation.

The Importance of ISAE 3000 Assurance

Accurately measuring aviation’s carbon footprint is a complex challenge—but it’s also essential. That’s why Cirium sought independent validation of its EmeraldSky Flight Emissions methodology. The recent achievement of ISAE 3000 Reasonable Assurance, following a detailed review by PricewaterhouseCoopers LLP (PwC), is an important step in helping the industry rely on data it can trust.

ISAE 3000 is a globally recognized standard for assurance of non-financial information. Achieving Reasonable Assurance—the highest level available—means that EmeraldSky’s methodology, internal controls, and data processes have been thoroughly assessed and found to meet the standard’s rigorous requirements. For those using the data, it brings greater confidence in how emissions are modeled and reported.