In the E-SAT project, the development of an extremely quiet, hybrid-powered small aircraft will be driven forward, which, as an Air Taxi, will connect regional centres and rural regions on direct routes and will significantly shorten travel times. The Institute of Aerospace Systems at RWTH Aachen (ILR) will be responsible for the integration of the novel propulsion concept into the overall system together with the FH Aachen and the Institute of Flight System Dynamics.