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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(Instructor added note: FL 600 or Flight Level 600, means a flying altitude of 60,000 ft.MSL, for more details, check out this website .) Class B. Generally, airspace from the surface to 10,000 feet MSL surrounding the nation's busiest airports in terms of airport operations or passenger enplanements.