the atmosphere above a nation and deemed to be under its jurisdiction.

A three-dimensional space criss-crossed by airways. In keeping with lCAO (–) rules, worldwide airspace is subdivided into various classes. The provision of air traffic control is defined for each class, together with the applicable flight rules (– DELTA, Upper airspace). Distinction is made between civil and military airspace; each of these is primarily reserved for one user group. Since integration (–), skyguide manages all of Swiss and some foreign delegated airspace, and in so doing improves both flexibility of use and capacity.

the space in the atmosphere immediately above the earth

Space in the air above the surface of the earth or a particular portion of such space, usually defined by the boundaries of an area on the surface projected upward.

Airspace means the portion of the atmosphere controlled by a particular country on top of its territory and territorial waters or, more generally, any specific three-dimensional portion of the atmosphere.