The new emerging generation of SuperSonic Transport (SST) aircraft demands an enhanced approach for the consideration and analysis of its impact on environment, with the subsequent delivery of relevant Standards and Recommended Practices (SARPs) to make the certification of a supersonic aeroplane possible in the 2020-2025 timeframe. Focusing on noise generated during Landing and Take-Off (LTO) cycle, the presented activities address the development of a methodology aimig at predicting noise levels in the early stages of SST aircraft design process, accounting for noise requirements as a design constraint and supporting a design-to-noise approach. The methodology includes a supersonic aircraft noise model in which overall aircraft noise is predicted as an assembly of major noise sources, each modelled with an individual semi-empirical noise source model based on the equations reported in “Aircraft Noise Prediction Program – Theoretical Manual” published by NASA.