We start knowing the environment (1A), then we need a the skeleton (1B). Propulsion is needed at least to take off (1C), then Equipments and Systems with their connections (1D) and control and maintain the flight path (1 E) and, aircrafts must be designed and validated as a whole (1F). The air traffic must be controlled (1G) and adequate airports must be provided (1H). Human factors must always be taken into account (1 I) Innovative aerial systems are continuously developed (1J) Nowadays we are specially involved in development of unmanned systems (1K). Digitalization of industrial processes is crucial also in aeronautics (1L)