The Corsia timeline

2016

ICAO agrees to offset emissions growth

from 2021 in approach known as "Corsia"

ICAO council adopts "SARPs"

(Standards and Recommended Practices),

laying out criteria for Corsia offsets

2018

All ICAO members start monitoring

and reporting emissions from

international flights

2019

2021

Corsia begins voluntary pilot phase

2024

Corsia begins voluntary first phase

Corsia begins mandatory second phase,

with exemptions for some small emitters

2027

2032

ICAO reviews if Corsia should be ended,

extended or improved after 2035

2035

Second phase ends