Air transport faces a variety of challenges. Due to the global increase in air traffic volume, enhancing aerodynamic efficiency during the take-off and landing phases, as well reducing flight noise, will become even more important than before. As a partner in a variety of national and European research projects, DLR is meeting these challenges head on. The design and development of complex flap and transmission systems with far-reaching effects on the take-off and landing properties as well as the noise emission of aircraft, is therefore one of DLR's core research areas. In cooperation with the high-lift systems department of Airbus in Bremen, DLR explores current research questions.