The aviation industry aims to integrate communication, navigation, and surveillance (CNS) services in order to use spectrum more efficiently and increase resilience while enabling optimal separation between aircraft and maintaining safety. In this context, the EU-funded MIAR project will focus on the capabilities of the L-band digital aeronautical communication system (LDACS) in supporting CNS services on aircraft. The project will also integrate multiple modularly complementary navigation technologies such as e-DME, terrain-aided navigation, and radar-based navigation at FMS level. MIAR will specifically demonstrate the navigation function in the LDACS and the other technologies through real-time flight experiments. Furthermore, the project will address additional improvements by validating air-ground SWIM solutions.