§ Lord Kennetasked Her Majesty's Government:
Whether they consider national sovereign rights pertain to vehicles, whether civil or military, that operate above national airspace. [HL4195]
§ Lord Sainsbury of TurvilleNational sovereignty applies to airspace; no sovereignty applies in outer space. There is no established definition of the height at which airspace ends and outer space begins.
Regarding vehicles, a state on whose registry a space object appears retains jurisdiction and control over such object while in outer space (Article VIII, 1967, Outer Space Treaty).