Composite materials have highly contributed to the reduction of CO2 emissions of last generation aircrafts, due to their lightweight capabilities. However, the environmental burden during composite raw material production, part manufacturing and waste treatment versus aluminium alloys has become a priority during recent years and needs to be addressed asap. This applies to current aircrafts but above all to ensure that composites are the best material choice for future more conventional or breakthrough products based on sustainable aviation fuel or liquid hydrogen propulsion. This presentation has the intention to be a general and comprehensive overview of the current situation and opportunities regarding composite sustainability for commercial aeronautical sector, including: - Problem understanding: composites are key for more sustainable aviation - As-is situation: raw material and part production, composite scrap treatment, benchmark with other industries. - Opportunities to develop more sustainable composites: recycling technologies, recyclable resins, biosourced composites and mass balance, substance compliance, industrial carbon footprint reduction…. - Some tips and recommendations about how to approach the development of more sustainable composites and what to prioritize from a technical point of view.