Real-time simulations (RTS) are widely recognised as a means to support the validation process of systems and procedures up to the highest operational readiness levels and are therefore widely used to support validation campaigns in the SESAR context. With the development of new ATM concepts in recent years and those expected in the near future (e.g. innovative air mobility,) verification and validation processes have become increasingly complex, with increasing demands on the infrastructures for validating these concepts and operational conditions. The project aims at supporting a wide diffusion of interoperability standards among ATM validation platforms. An economic analysis of performing validation processes for ATM/AAM/U-space interoperability concepts and solutions through a multi-site validation architecture will be performed. An experimental demonstration test will be defined and performed to collect data for this analysis.