You're right that the earlier decision was more related to air travel. The precedent that was set is that a property owner can only claim air space up to a heig

You're right that the earlier decision was more related to air travel. The precedent that was set is that a property owner can only claim air space up to a height that is actively used by the property owner. So if you have a windmill, for example, you can claim the airspace to a greater height than your neighbor with only a trampoline. FAA defines minimum heights manned aircraft, usually 1000ft above the tallest obstacle when flying near a city (helicopters are exempt from this rule, though). FAA also defines rules for radio-controlled aircraft. Namely, small r/c aircraft must fly below 400ft and within line-of-sight of the pilot.