500 ft rule. An aircraft must maintain an altitude of 500 feet above the surface, except over open water or sparsely populated areas. In those cases, the aircraft may not be operated closer than 500 feet to any person, vessel, vehicle, or structure.
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The military, in addition to following its own flying rules on low-level altitudes and airspeed, also follows those in Federal Aviation Regulation 91.79 which states that no plane may fly closer than 500 feet from any person, vessel, vehicle or structure.
The Federal Aviation Regulation (FAR) Part 91.119 indicates that, except when necessary for departure or landing, the minimum altitude over urban areas is 1,000 feet above ground level (AGL) and 500 feet AGL over rural areas.
VFR cruising altitude rules in the US and CanadaOn a magnetic course of 0-179 degrees shall fly at an odd thousand ft MSL altitude +500 feet (e.g., 3,500, 5,500, or 7,500 ft); or. On a magnetic course of 180-359 degrees shall fly at an even thousand ft MSL altitude +500 feet (e.g., 4,500, 6,500, or 8,500 ft).
2 Many pilots plan for a higher cruising altitude at night, simply because suitable emergency landing sites may be fewer and farther between. The difference between cruise at 8,500 and 10,500 feet may not seem like much until you have to glide back to Earth at 800-900 fpm without power.
While helicopters can fly long distances over water, limitations like their smaller fuel tanks make them impractical for crossing whole oceans without refueling or making an extended stopover somewhere along the way.
Summary. Military fighter aircraft fly low to the ground for three reasons: surprise, accurate bombing, and to avoid radar detection. NATO air forces changed tactics after the Vietnam War to fly low and avoid radar after many American aircraft were shot down by surface-to-air missiles.
Presently the airspace between FL 600 and up to the border between the earth's atmosphere and outer space (generally an altitude of approximately 100 km (62 mi) (the Kármán line)) is not regulated. The FAA does consider the airspace above FL600 to be controlled Class E airspace.