We present an Experimental Air Traffic Simulator (EATS).It is conceived as a tool for preliminary evaluation of flight procedures, algorithms and human-machine interfaces to be used in future Navigation and Air Traffic surrounding the new Communication, Navigation and Surveillance System to Air Traffic Management (CNS/ATM). The proposed EATS simulator version provides realistic data forthe aircraft dynamic and includes the exchange of information among the aircraft from the point of view of the Air Traffic Control (ATC). It also takes into account the meteorological conditions and terrain constraints. This system has been designed as a Multi-Agent System and implemented on a JADE framework. Its architecture facilitates its later extension to incorporate and to evaluate new communication protocols and negotiation between agents operating in a specific air space.