Aviation contributes to more than 2% of global greenhouse gas (GHG) emissions and its activity is increasing exponentially. In the absence of further measures, carbon dioxide (CO2) emissions from international aviation are estimated to almost quadruple by 2050 compared to 20101. In the process of obtaining new and more efficient products, numerical simulation (such as Computational Fluid Dynamics, CFD) is becoming a key player in aeronautical design. However, in despite of the current deployment CFD during the design process, NextSim partners, recognise that there is a need to increase the capabilities of current numerical simulation tools for aeronautical design by re-engineering them for extreme-scale parallel computing platforms. By doing so, the aerospace industry will be able to expand the use of HPC (High-Performance Computing) in the design loop. NextSim aims at improving industrial applicability of CFD software, in particular CODA, on leading-edge HPC systems. The CODA solver includes classic finite volume capabilities and new highly accurate high order discontinuous Galerkin schemes, all specifically tailored for aeronautical applications, and available to all partners. The CODA solver will be the new reference solver for aerodynamic applications inside AIRBUS group (including aircraft and helicopters), as such, it will be used by AIRBUS for the design of a variety of engineering applications, having a significant impact in the aeronautical market. This targets the efficient implementation on modern HPC hardware as well as extended functionalities making use of the available HPC resources, in particular turbulence scale-resolving simulation capabilities which would not be viable without the extensive computational resources offered by massively parallel HPC cluster environments. NextSim specifically aims at both algorithmic/numerical improvements and HPC aspects of their implementation at the same time, which can be conflicting goals in some cases.