Above our heads, an invisible aviation network exists. Managed by a multitude of air traffic controllers, it allows thousands of aircraft to arrive, depart and pass over Europe on a daily basis. The European Commission’s Single European Sky initiative (SES) aims to streamline this management, improving efficiency and delivering environmental benefits, but it remains incomplete. It is essential that SES recognises the position of airports within this network, and the role that airports will play in helping deliver the benefits of SES. ACI EUROPE and its members are heavily involved with SESAR – the technical arm of SES – in a range of research projects designed to transform airports’ relationships with air traffic control.