Altitude - above a country, or just in the 'atmosphere'?
As a travelling member of SLF I've flown over many nations which I've never step foot on - i.e. China - and 'gorped' out of the window for hours on end.
I've spent 1000's of hours in UK airspace at 30,000+ and at 1/4000ft in props; but both levels feel like I'm above "home". But at 30+k over asia it doesn't look or feel real.
Q. at which alt do you actually begin to fly over a country rather than just the space above it?
e.g.
1) <5k ft
2) <10k ft
3) when someone on the ground can hear your engine? (tp)
4) when you're low enough to see people on the ground?
5) ??
At high altitude the earth just looks like the earth!