CORSIA
The Carbon Offsetting and Reduction Scheme for International Aviation is the ICAO programme under which airlines and large operators must offset growth in CO2 from international flights above a 2019 baseline. It became mandatory for participating states in 2027 after a voluntary phase. Business aviation is largely exempt because the scheme only applies to operators emitting more than 10,000 tonnes a year on international routes, but big charter fleets and fractional providers do fall within it, and their offset costs filter into pricing. CORSIA's importance for the sector is mostly indirect: it defines which offsets and SAF count as eligible, a standard many corporate flyers now use for their own reporting.