For the past 20 years, DSNA, the French Air Navigation Service Provider, has been pushing for greener initiatives to promote an environmental culture. To accelerate this transition, DSNA has made the reduction of its environmental impact its primary focus. In the context of the SESAR programme, DSNA leads the project ADSCENSIO (ADS-C ENables and Supports Improved ATM Operations), which brings together 21 partners including AIRBUS, the ESSP, manufacturers and the main European ANSPs, in collaboration with airlines. This demonstration project aims to progress towards the implementation and use by ANSPs of on-board data transmitted by aircraft. This data provides a more precise vision on the ground of the aircraft’s future trajectory and thus reduces fuel consumption and associated CO2 emissions. As part of this project, 9 demonstrations are being carried out in Europe, including two in French airspace using DSNA tools such as IODA and 4Me to display most relevant airborne trajectory data. For DSNA, this project contributes to the implementation of a green operations strategy which concerns all phases of the rolling process from the strategic and pre-tactical phase up to the flight planning and eventually its execution. Once the relevant times & geographical locations for more eco-responsible trajectories are identified, the objective is to allow aircraft operators to make use of them as flight planning opportunities, and then, considering real time air traffic and live weather conditions, to ensure the optimization of flight profiles for every phase of a flight: departure, cruise & arrival. ADSCENSIO is the main contributor to prepare, as request by an European implementation rule, the capability of European Air Navigation Service Providers’ ground systems to make use of aircraft trajectory data by 2027. This project has received funding from the SESAR Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme.