The project is developing the future communications, navigation and surveillance technologies to support and manage the operational services, like the four-dimensional trajectory management, in the future ATM system. Performance requirements for CNS systems are becoming increasingly complex and demanding and need to be considered as part of an integrated and holistic system of systems, which includes air and ground CNS solutions considering convergence towards a common infrastructure, and a unified concept of operations, where possible. In parallel, CNS systems and infrastructure for both airborne and ground must take a more business- and performance oriented approach with efficient use of resources delivering the required capability in a cost-effective and spectrum efficient manner.