airspace. The space that extends upward from the surface of land, esp. so far as is necessary
for the owner or possessor to have reasonable use and enjoyment of the incidents of its ownership
or possession. Cf. OUTER SPACE.
national airspace.Int’l law. The pillar of air above a nation’s territory — including internal
waters and the territorial sea — over which it has complete and exclusive sovereignty and through
which foreign aircraft have no right of innocent passage. • There is no agreement on the boundary
between national airspace and outer space.
navigable airspace.The area above the legally established minimum flight altitudes, including
the area needed to ensure safe takeoffs and landings of aircraft. 49 USCA § 40102(a)(30). [Cases:
Aviation 3, 231. C.J.S. Aeronautics and Aerospace §§ 7–9, 21, 73.] [Blacks Law 8th]