At what altitude does Class E airspace begin?

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Class E airspace typically begins at 1,200 feet above mean sea level (MSL) in most areas. However, it is important to note that Class E airspace also has specific requirements depending on surrounding airspace and geographic conditions. For example, in areas where the airspace is not designated as controlled airspace, it usually begins at 1,200 feet, while in other contexts, it could extend up to higher altitudes such as 14,500 feet MSL in certain circumstances for transition purposes before reaching Class A airspace.

In some sectors, above 14,500 feet MSL, Class E serves as a transition to Class A airspace, which starts at 18,000 feet. Hence, the altitude of Class E airspace varies, but the significant point is that it does indeed start at 1,200 feet MSL in general circumstances, and there may be exceptions or expansions up to 14,500 depending on air traffic and operational needs. Thus, while option B presents a valid altitude for Class E airspace in specific scenarios, it does not represent the general starting altitude commonly recognized at 1,200 feet MSL.

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