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VFR requires a pilot to be able to see outside the cockpit to control the aircraft's altitude, navigate, and avoid obstacles and other aircraft. [3] Governing agencies establish specific requirements for VFR flight, including minimum visibility, and distance from clouds, to ensure that aircraft operating under VFR are visible from enough distance to ensure safety.
For limits to ownership above land, an old principle in the law is ad coelum, meaning that property rights extend "to the sky" (and below the earth). In the past, rights to "the sky" have been unenforcable – birds need take little notice of humans' overhead property rights – but with modern technology extending human reach, the idea of ad ...