MORE&LESS addresses the challenge of contributing to help Europe shape, together with the international community, high environmental standards in line with ICAO Assembly Resolution A39-1, by a thorough and holistic analysis of the environmental impact of supersonic aviation. MORE&LESS aims at maintaining a high level of citizens' and environmental protection at local, regional and global levels, and supports the consequent establishment of regulations and procedures for the future supersonic aviation through solid technical bases. The scientific findings in the fields of aerodynamics, jet-noise, sonic-boom, propulsion, pollutant emissions and environmental impact are in fact transposed into guidelines for the Regulatory Community. Through low and high-fidelity modelling activities and test campaigns, already accepted and validated software tools are enhanced and extended to cover supersonic aviation, to be eventually integrated into the multidisciplinary holistic framework. The application of this framework to the case-studies is the proving ground to verify that the enabling technologies of supersonic aircraft, trajectories and operations comply with the environmental requirements. The case-studies cover the entire spectrum of supersonic speed regime and include the most promising aircraft configurations, propulsive technologies and alternative fuels, such as bio-fuels and liquid hydrogen. MORE&LESS fosters international cooperation, thus paving the way towards the definition of global and internationally agreed regulations, while contributing to maintain world-class knowledge and skills in Europe in the field of supersonic aviation. MORE&LESS targets the engagement of new generations of students, scientists and engineers to inspire and challenge them to build and manage the environmentally sustainable supersonic aviation of the future.

The stratosphere is the highest layer in the atmosphere where aircraft can still fly. Nevertheless, it is presently rarely exploited for commercial aviation. As Europe’s Vision for Aviation predicts globally a six-fold increase in passenger by 2050, flight levels above the troposphere become attractive and maybe the only way to realize this. While the lower stratosphere could still be reachable for classical aircraft, the higher altitudes would demand for higher speeds. Various technologies, systems and novel aircraft concepts related to high-speed transport have progressed rapidly over the last 20 years showing their technical feasibility and readiness up to TRL-3. Technology roadmaps elaborated by industrial and research teams indicated their readiness-level can easily be brought up to TRL-6 by 2035 provided the related application can be shown to be commercially exploitable. The first project goal covers the multi-functional integration of propulsion, aerodynamics, airframes and on-board systems acros