So the question, then, is how high do you need to go before you're no longer in a country's airspace?
Most countries seem to claim somewhere between 70Km and 100Km as their airspace.
If someone has more details on this, it's very welcome.
Besides, a lot has changed in the use of airspace and space in the last 8 years.
Yet, I don't know of any authoritative source for the actual current claims of most countries.