What is minimal altitude that aircraft (rocket?) can fly above any country without any permission? I mean, at what altitude ends country's airspace?

  • $\begingroup$ I cannot answer properly, but I think it will depend if the device (might not be an airplane?) is armed or not. $\endgroup$ – Trebia Project. Feb 21 '16 at 13:07
  • $\begingroup$ @TrebiaProject. I thought it does not matter. But if it is important let's suppose that it is military device and it is armed. $\endgroup$ – vasili111 Feb 22 '16 at 7:50
  • $\begingroup$ according to space treaties you should not have any weapon there, so it will be restricted to the area between what we call apace and the country limit $\endgroup$ – Trebia Project. Feb 22 '16 at 12:17
  • $\begingroup$ @what about military spy (not armed) device? $\endgroup$ – vasili111 Feb 24 '16 at 12:39
  • $\begingroup$ the only thing I know for sure is the mass destruction weapons cannot be in space... difficult to make the difference between weapon and some systems $\endgroup$ – Trebia Project. Feb 24 '16 at 22:37

Actually, what you're asking are two different questions- According to ICAO ( ICAO Annex 11: Air Traffic Services), Class G airspace is uncontrolled and aircraft can fly in the without ATC permission. The definition if Class G is left to the regulatory authorities of individual countries (in US, it is where the other airspace classes are undefined).

Where does the airspace of the country end is a completely different one and as of now, there is no agreed definition. The United Nations General Assembly Committe on Peaceful Uses of Outer space is still in the process of defining what exactly an outer space is.


What is minimal altitude that aircraft (rocket?) can fly above any country without any permission?

100 km, probably

the Kármán line, at an altitude of 100 km (62 mi) above sea level,[7][8] is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space.

- Wikipedia


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