The Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) is a global initiative aimed at enhancing sustainability and reducing the environmental impact of the aviation industry. The article discusses Thailand's involvement in CORSIA since 2021 and highlights the upcoming enforcement in 2027 that will lead to increased costs for Thai airlines in purchasing carbon credits. Despite the financial burden, CORSIA is expected to stimulate markets for carbon credits and sustainable aviation fuels, contributing to emissions reduction. The article emphasizes the challenges in decarbonizing the aviation sector, especially as emissions have rebounded post the Covid-19 pandemic. However, the article mentions the long-term goal of achieving net zero carbon emissions by 2050 and the role of CORSIA in moving the industry towards sustainability. CORSIA requirements include monitoring, reporting, and verifying greenhouse gas emissions, with Thailand's Civil Aviation Authority actively involved in overseeing these processes. Overall, CORSIA is seen as a positive step towards a more sustainable aviation industry, albeit with initial financial implications for airlines.