Europe’s armed forces operate more than 150,000 flights per year. To accommodate these flights, the airspace is often closed, sometimes at short notice, to civil traffic. Given the growth of air traffic demand and complexity, SESAR is developing operational and technical solutions that allow more flexible civil-military cooperation to maximise the use of airspace. Key to this cooperation is the integration of military operations. The project aims to advance solutions to manage mission trajectories and collaborative decision-making at network level and in ATC operations, including advanced design principles for military access to the airspace.