The International Civil Aviation Organization (ICAO) has approved Isometric to issue certificates for the Second Phase of the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA). CORSIA is the United Nations scheme that requires airlines to offset emissions growth from international flights. Airlines must offset emissions above a baseline of 85% of 2019 levels, using certificates from ICAO-approved programs.
This approval means airlines can now use Isometric-issued certificates to meet their CORSIA obligations under both the First Phase (2024 to 2026) and the Second Phase (2027 to 2029), starting with Biochar and Direct Air Capture. Each certificate is backed by public evidence on Isometric’s Registry, so airlines can trust what they’re buying.
Demand for eligible CORSIA certificates is already outpacing supply. The International Air Transport Association (IATA) estimates airlines need around 200 million eligible certificates by January 2028, with only around 43 million currently available.
ICAO’s evaluation found that Isometric meets its requirements for transparency, scientific rigor, and integrity. The approval follows Isometric’s First Phase approval in November 2025 and the Integrity Council for the Voluntary Carbon Market’s (ICVCM) approval of nine Isometric protocols to issue certificates with the Core Carbon Principles (CCP) label.
Interested in buying or issuing CORSIA-eligible certificates? Get in touch.
