Optimising airspace capacity is a key to accommodating current and future air traffic, while maintaining safety, improving efficiency and reducing aviation’s environmental impact. The project focused on dynamic airspace configuration and the design of “smart sectors”. This covers the design of basic volumes of airspace with optimal distribution of workload, tailored around specific safety and operational requirements, including complexity. As a by-product, the application of cost-efficient capacity actions allowed for more accurate demand and capacity balancing planning, thus reducing the number of required demand measures.