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Chapter 15: Airspace

What are the 4 types of airspace?
The two categories of airspace are: regulatory and nonregulatory.
Within these two categories, there are four types: controlled, uncontrolled, special use, and other airspace.
At what altitude does airspace stop?
There is no international agreement on the vertical extent of sovereign airspace, with suggestions ranging from about 30 km (19 mi)—the extent of the highest aircraft and balloons—to about 160 km (100 mi)—approximately the lowest extent of short-term stable orbits.
What is the airspace limit?
A country's sovereign airspace generally extends to a height of approximately 60,000 feet above ground level, according to international standards.
Above this altitude, it is considered to be outer space and falls under the jurisdiction of international space law.
Restricted airspace is an area of airspace typically used by the military in which the local controlling authorities have determined that air traffic must be restricted or prohibited for safety or security concerns.

What are the 4 types of airspace?