A concern that a planning authority may have is: that the building can easily be adapted for manufacturing or commercial storage of goods and therefore the associated surrounding noise and road traffic. I don't see how an authority can object to buildings appropriate to the operation of an airfield; no more than should they object to a farmer building a barn. A hangar for light aircraft does not need to be obtrusive in height and can be of a colour appropriate to the surroundings
Hedge rows are popular with planners but they are not appropriate for surrounding an aerodrome. They are a nesting place for birds which are a hazard for aeroplanes.
If the airfield has been in use for over ten years without neighbour complaints then there are few objections that can be sustained now. Climb and approach paths can be detailed along with pilot emergency actions, provided to pilots, that will minimise any risks to neighbours.