Carbon Offsetting and Reduction Scheme for International Aviation

NSF offers verification for the Carbon Offsetting and Reduction for International Aviation (CORSIA) program, administered by the International Civil Aviation Organization (ICAO).

CORSIA is a key element of ICAO’s strategy for achieving carbon-neutral growth from 2020 onward.

Timing and Deadlines

As of January 1, 2019, airplane operators need to implement a monitoring, reporting and verification (MRV) system for CO2 emissions from international flights. The annual emissions reports must be verified by an independent third party.

CORSIA’s carbon offsetting scheme has three phases:

  1. Pilot Phase (2021-2023) – Voluntary
  2. First Phase (2024-2026) – Voluntary
  3. Second Phase (2027-2035) – Applies to all ICAO Member States

Airplane operators have until May 31 in 2020 and 2021 to submit emission reports and verification reports to their State authorities. From 2022 onward, the deadline for submitting these reports advances to April 30.


  • Consider preparing for verification by performing an internal audit, then contact a third-party verification body by July of the applicable emissions reporting year.
  • The verification body performs strategic analysis and risk assessment by September of the year for which the airplane operator is reporting emissions.
  • Verification bodies use a two-stage approach to verification, with a “preliminary verification” during the actual reporting year followed by finalization of verification activities in the first months after the end of the reporting year.

Ready to Begin the Process?

Contact us with questions or to receive a quote.