In Class A airspace, is ATC clearance required?

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Multiple Choice

In Class A airspace, is ATC clearance required?

Explanation:
Class A airspace is fully controlled and ATC has the authority to separate all traffic there. Because of this, you must have ATC clearance to enter and operate within it. In practice, most operations are IFR, but the essential rule is that clearance is required for any flight in Class A. VFR operations are not allowed there, so the idea that clearance is needed only for IFR is incorrect. The notion of depending on altitude doesn’t fit either, since Class A spans from 18,000 feet MSL upward to its upper limit, and the clearance requirement applies across that entire block. So ATC clearance is required to operate in Class A.

Class A airspace is fully controlled and ATC has the authority to separate all traffic there. Because of this, you must have ATC clearance to enter and operate within it. In practice, most operations are IFR, but the essential rule is that clearance is required for any flight in Class A. VFR operations are not allowed there, so the idea that clearance is needed only for IFR is incorrect. The notion of depending on altitude doesn’t fit either, since Class A spans from 18,000 feet MSL upward to its upper limit, and the clearance requirement applies across that entire block. So ATC clearance is required to operate in Class A.

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