The presence of the OSCAR project has been shown at the TandemAERodays19.20 event, held from the 27th until the 30th of May 2019, in Bucharest, Romania. The European Aeronautics Days (Aerodays) has been the leading event in aviation research and innovation, mirroring the priorities and strategies set within the European Union's Research Framework Programmes. This year's 8th edition was successfully co-organized by the European Commission and the Romanian Presidency of the European Council. TandemAERodays19.20 has provided a great platform to share and review the latest developments in aeronautics and air transport across the European Union, further strengthening its leadership on a highly competitive and strategic international market. In this frame, the OSCAR concept and foremost objectives have been communicated to the event’s participants, as well as promotional material on the running OSCAR mini-survey on OPEN SCIENCE, has been distributed.