The thesis focuses on the purely dynamic rotation model of a dual-stage planetary transmission for a hybrid turboprop aircraft for regional transport. The model generates the mass of the entire transmission and the dynamic response of the same as a function of the relative phases of flight, through precise inputs (power and rotational speeds of turbine and electric motor, propeller speed and overall gear ratio). The first chapter focuses on how aircraft transport affects CO2, NOx and other pollutant emissions. It continued by analysing what were the possible design proposals of the various companies in order to promote greater electrification of aircraft and reduce the carbon footprint following what is already happening in the automotive industry.