Functional Airspace Blocks (FABs), are intended to combat fragmentation of the airspace by establishing co-operation between ANSPs, optimising the organisation and use of airspace through design of optimal control sectors and routes over larger areas and hence achieving overall synergies through economies of scale.

4. Where charging zones extend across the airspace of more than one Member State, which may be a consequence of the creation of a common charging zone in a functional airspace block, the Member States concerned shall ensure consistency and uniformity in the application of this Regulation to the airspace concerned to the maximum possible extent.

(14) The concept of the flexible use of airspace should be applied effectively; it is necessary to optimise the use of sectors of airspace, especially during peak periods for general air traffic and in high-traffic airspace, by cooperation between Member States in respect of the use of such sectors for military operations and training.

The concept of the flexible use of airspace should be applied effectively; it is necessary to optimise the use of sectors of airspace, especially during peak periods for general air traffic and in high-traffic airspace, by cooperation between Member States in respect of the use of such sectors for military operations and training.

(14) The concept of the flexible use of airspace should be applied effectively; it is necessary to optimise the use of sectors of airspace, especially during peak periods for general air traffic and in high-traffic airspace, by cooperation between Member States in respect of the use of such sectors for military operations and training.

‘airspace restriction’ means a defined volume of airspace within which, variously, activities dangerous to the flight of aircraft may be conducted at specified times (a ‘danger area’); or such airspace situated above the land areas or territorial waters of a State, within which the flight of aircraft is restricted in accordance with certain specified conditions (a ‘restricted area’); or airspace situated above the land areas or territorial waters of a State, within which the flight of aircraft is prohibited (a ‘prohibited area’);