The first phase of the project, which lasted from October 2020 to May 2021, comprised an analysis of the approaches and tools that are used by the engineers within the SE 2A research cluster. A main aim was to reveal tacit assumptions, which guide the work of the engineering projects, and to investigate parameters and metrics that are applied within these projects. Here, the focus was on the engineers’ understanding of sustainability as well as their underlying assumptions of passengers’ and airport residents’ needs and demands with respect to sustainable, low-noise, safe, and reliable aviation.