In the reign of Edward I (1239-1307), disputes involving the ownership of birds in trees or the right to build a structure which jutted over the edge of a neighbor's land, were settled by the maxim: Cujus est solum, ejus est usque ad coelum (He who owns the soil, owns above it to the sky).
Although the maxim (credited to Accursius, 1182-1260) was coined in a day when man was earthbound, it has survived to provide endless argument on the question of what constitutes trespass by aircraft. Today...
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