Better to beg forgiveness than to ask for permission...
I do want a hangar at some point, but the planning application will say it's a machinery shed, as suggested above.
Noise was no problem for me; neighbours run bird scarers, heavy trucks and farm machinery past my property and harvest at all hours. A little Rotax in return isn't going to make their pots call my kettle black.
Live and let live ... except those pesky stud owners - training horses to be transported in trucks and race in front of big crowds but a little airplane noise every once in a while is a problem?
My wife's horses don't bat an eyelid when a chopper lands 20 meters away from them.