What are the vertical limits of Class A airspace?

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Multiple Choice

What are the vertical limits of Class A airspace?

Explanation:
Class A airspace sits high above the surface and is designed for IFR traffic. Its vertical limits run from 18,000 feet above mean sea level up to and including flight level 600, which is 60,000 feet MSL. This means all operations in this layer must be conducted under IFR with explicit clearance to enter. The range from 18,000 to 60,000 feet is the correct span; it isn’t from the surface or from lower altitudes.

Class A airspace sits high above the surface and is designed for IFR traffic. Its vertical limits run from 18,000 feet above mean sea level up to and including flight level 600, which is 60,000 feet MSL. This means all operations in this layer must be conducted under IFR with explicit clearance to enter. The range from 18,000 to 60,000 feet is the correct span; it isn’t from the surface or from lower altitudes.

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