CORSIA:  Carbon Offsetting and Reduction Scheme for International Aviation 

Since October 2016, all member states of the International Civil Aviation Organization (ICAO) have reached an agreement to adopt CORSIA, a new program to address Greenhouse emissions by offsetting the growth in CO2 emissions from international flights as compared with the baseline years 2019 and 2020.

The Carbon Offsetting and Reduction Scheme for International Aviation (COSRIA) aims to contribute to the sustainable development of civil aviation and to mitigate the CO2 emissions of international air transportation.

The CORSIA has three phases: a pilot phase (2021 – 2023); a first phase (2024 – 2026); and a second phase (2027 – 2035).  The difference between the phases is that the participation of States in the CORSIA offsetting in the pilot phase and in the first phase is voluntary, whereas the second phase applies to all ICAO Member States. The figure below illustrates the different phases of CORSIA.


Greece participates in the CORSIA Program from the beginning of the pilot phase (2021-2023). HCAA is the State authority for the implementation of CORSIA as defined in Annex 16, Vol. IV published by the International Civil Aviation Organization.

For more information on implementing CORSIA, visit the relevant ICAO website here