The SE²A Cluster of Excellence is an interdisciplinary research centre investigating technologies for a sustainable and environmentally friendly air transport system. The Technical University of Braunschweig, the German Aerospace Center (DLR), Leibniz University of Hannover (LUH), Braunschweig University of the Arts (HBK) and the Physikalisch-Technische Bundesanstalt (PTB) have joined forces in this extraordinary project.