I'm puzzled why you'd be so hellbent on doing aerobatics etc
Amadis, to save you being puzzled............
I am privileged to fly a collection of aircraft belonging to a museum in the USA based at an airfield that is surrounded as far as the eye can see by 8/8 large trees. For obvious reasons, we always fly these priceless aircraft within gliding distance of the airfield since it is the only suitable landing spot within a 10 mile radius. Some of these aircraft are aerobatic and need to be exercised!
I was merrily cavorting around in the Stearman about a mile away from the airfield and upon landing a nice gent wondered over and kindly pointed out that what I was doing was super to watch, but was illegal because of the proximity of an airway. I respectfully pointed out that the airway base was 4500' and I was well below that. He continued to educate me as to the error of my ways. I have of course, desisted forthwith, but it has always vexed me that this cannot be true.
Thank you guys for pointing out that it is indeed true (strange....but true!).
Jez.