Often in Europe the military does own the airspace so to speak. Civilian traffic has to route around it. I had some trouble during the summer when Obama and the Queen were due to visit. (Not at the same time). The military were holding intercept exercises, even though we don't have jet fighters or military radar

We drop inside a a military exercise area which is rarely open. But this time, I took off and ATC told me to call mil radar, even thought there is no military radar

. They wouldn't let me above FL70 and then told me I couldn't fly at all for the next hour or two.
My boss wasn't having that. He started making phone calls right up to the base commander, threatening to go further up chain of command. Ten minutes later, he told me 'You've got your clearance!'

I wasn't sure initially and on the first flight, I half expected to look out and see a grey PC9 sitting on my wing!