Canada has seven classes of airspace. Each one has its own rules about the types of aircraft that can use it and the communications equipment pilots need to use.
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Unless designated at a lower altitude, Class E airspace begins at 14,500 MSL over the United States, including that airspace overlying the waters within 12 NM of the coast of the 48 contiguous states and Alaska, up to but not including 18,000 feet MSL, and the airspace above FL 600.
In the 1900s, Hungarian physicist Theodore von Kármán determined the boundary to be around 50 miles up, or roughly 80 kilometers above sea level. Today, though, the Kármán line is set at what NOAA calls “an imaginary boundary” that's 62 miles up, or roughly a hundred kilometers above sea level.
It has more than 19,000 airports and 600 air traffic control facilities. In all, there are 41,000 NAS operational facilities. In addition, there are over 71,000 pieces of equipment, ranging from radar systems to communication relay stations. On average, about 45,000 flights use NAS services each day.
In the United States, the Federal Aviation Administration (FAA) has the sole authority to regulate all navigable airspace exclusively determining the rules and requirements for its use.
As the federal authority over operations in all airspace and the regulating authority over operations, the FAA will ensure that the ETM cooperative vision aligns with agency goals and meets the requirements for safe and efficient operations.
Class A airspace generally begins from 18,000 feet mean sea level up to and including 60,000 feet. Operations in Class A are generally conducted under Instrument Flight Rules and primarily used by higher performance aircraft, airline and cargo operators, etc.