The navigable airspace is a limited national resource. Navigable airspace is defined as the airspace at or above the minimum altitudes of flight that includes the airspace needed to ensure safety in the takeoff and landing of aircraft.
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For airplanes, the minimum flight altitude while flying over congested areas or open air assemblies of persons is 1,000 feet above the highest obstacle within a horizontal radius of 2,000 feet. 14 C.F.R. § 91.119(b). Over uncongested areas, airplanes can operate at an altitude of 500 feet above the surface.
The two categories of airspace are: regulatory and nonregulatory. Within these two categories, there are four types: controlled, uncontrolled, special use, and other airspace.
There are two categories of airspace or airspace areas: Regulatory (Class A, B, C, D, and E airspace areas, restricted and prohibited areas). Nonregulatory (military operations areas [MOA], warning areas, alert areas, controlled firing areas [CFA], and national security areas [NSA]).
Class C airspace in the UK extends from Flight Level (FL) 195 (19,500 feet) to FL 600 (60,000 feet). Both IFR and Visual Flight Rules (VFR) flying is permitted in this airspace but pilots require clearance to enter and must comply with ATC instructions.
Fly below 120m (400ft) Flying below the legal height limit of 120m (400ft) will reduce the risk of coming across other aircraft, which normally fly higher than this.
There are six classifications of airspace in the United States; A, B, C, D, E, and G. Class A is the most restrictive and Class G the least restrictive. They can be categorized as: Class A – 18,000 feet and higher above mean sea level (MSL). Class B – Airspace around the 40 most congested airports in the country.
Private pilots, however, are permitted to fly in every airspace class except for Class A, which requires an instrument rating. Private pilots who do have an instrument rating, however, are allowed to fly in Class A, but they cannot exceed 18,000 feet in altitude.
(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.