This report provides an overview of technological, operational and policy measures that can accelerate the decarbonisation of aviation. Its goal is to support governments and aviation stakeholders looking to introduce aviation decarbonisation measures regionally, nationally and internationally. All measures are discussed in light of their cost-effectiveness and the potential barriers to their implementation. The report summarises the conclusions from an expert workshop held in February 2020 as part of the International Transport Forum’s Decarbonising Transport initiative.