„Sustainable and Energy Efficient Aviation“ (SE²A) deals with the challenge of making future air traffic energy efficient while simultaneously meeting the competing demands for continuous growth and environmental sustainability. SE²A involves the TU Braunschweig, the German Aerospace Center, Leibniz Universität Hannover, the Braunschweig University of Art and the National Metrology Institute of Germany. The Cluster of Excellence is part of the joint research area “Mobility”.