ICAO's CORSIA scheme requires airlines to offset international flight emissions above a 2019-based baseline, starting its mandatory Second Phase in 2027. Only ICAO-eligible credits (CEEUs) qualify; CEEUs trade around US$15-22/tCO2 now, with forecasts of US$25-36 in 2027, versus US$5-10 for general voluntary credits. Thailand's Premium T-VER is approved for the First Phase, but its Second Phase status is still under ICAO review, with clarity expected in Q4 2026. If you run a forestry, mangrove, rice, renewable energy or refrigerant project, track that decision and keep a backup standard ready. Otherwise, there is no action needed this quarter.