In this work, various on-board system architectures have been analyzed in order to replicate existent long- and medium-haul aircraft system architectures and possible new architectures related to more and all electric concepts. All methods for designing and modelling the design space have been explored using an internal software for the System Architecture Design, from the most basic concepts to the most complex ones. In this phase of the work the on-board systems analyzed were mainly the Flight Control System and Landing Gear System. The design space was adapted to the necessity of the work including the possible choices for the range of aircraft of interest.