A new generation of small, highly automated aircraft operating at low altitudes is emerging, alongside helicopters and general aviation. The coordination and deconfliction of these aircraft in primarily urban environments require a new communications navigation and surveillance (CNS) infrastructure. The project aims to develop an integrated CNS-as-a-service model to support both low-altitude piloted and U-space operations. It will leverage technologies such as 5G new radio, modern IP-based software-defined networking, and distributed computing capabilities to propose a flexible and resilient solution.