Mr. Ivan Hassamski, Single European Sky expert at BULATSA and active ATCO, was invited to outline BULATSA’s innovative ATM system at Leonardo stand at the annual World ATM Congress in Madrid. He highlighted the Dynamic Sectors Management applied to enhance the provision of ATC. To optimize usage of airspace and improve flight efficiency within the airspace of DANUBE FAB, BULATSA together with its partner ROMATSA, implemented cross-border sectorization which includes the delegation of airspace from Bucharest to Sofia and vice versa. Leonardo system currently used by BULATSA for the provision of ATC allows to dynamically move “on-the-fly” ATC sectors from the Area of Interest (AOI) to the Area Of Responsibility (AOR). This capability enables the application of the Airspace Delegation concept within the DANUBE FAB framework.