“Civil-military coordination and collaborative decision-making are key if we are to sustainably optimise our use of airspace.”

Flexible Use of Airspace is a key contributor to optimising the use of airspace, through proper civil-military coordination and strategic collaborative decision-making. An efficient use of airspace optimises the trajectories of civil aircraft, thereby reducing fuel burn and CO₂ emissions. The Traffic Light Scheme (TLS) goes beyond the classical Flexible Use of Airspace concept by releasing airspace reserved for the military during time slots when civil air traffic exceeds a pre-agreed traffic level on predefined routes. This process aims to reduce ATM congestion peaks and enables civil aircraft to fly trajectories that are more direct. After 10 years of TLS operations on horizontal airspaces and a successful 2-year trial focusing on vertical flight efficiency in upper airspace, the new TLS is now fully operational. It is roughly used 2 hours per business day, saving approximatively 1,000 t of fuel and 3,000 t of CO₂ per year.

We have built on the FUA principles that we have adapted to our own requirements, to achieve a win-win solution for both sides. At strategic level, we have applied the Advanced-FUA Military Variable Profile Area (MVPA) concept to our main training areas. MVPA volumes can be adapted to either civil or military requirements. Then priority rules are set that the French civil-military Airspace Management Cell applies at pre-tactical level. The real innovation is the establishment of pre-defined traffic thresholds. When these are overtaken, the priority rules are automatically applied without any further Collaborative Decision Making and the airspace is released via the European Airspace Use Plan / Updated Airspace Use Plan. This is completely transparent for the civil airspace users.