A study to investigate and assess the requirements associated with future Regional Aircraft in terms of future 'green' and other operational 'scenarios' and constraints, as seen by the Regional Airlines. The aim of the study lies in the identification, analysis, assessment and trade-off of the identified requirements in order to define the most 'optimum' combinations of these, overall. The results of the study will 'feed' the related design and technologies' development efforts under the CSJU GRA ITD. Representatives from various European Regional Aircraft Operators will be interviewed so as to establish the benchmark for the related study.