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 is defined by its vertical boundaries: it begins at Flight Level 180 (18,000 feet) and extends up to Flight Level 600 (60,000 feet). This range is why the correct answer is FL180 to FL600. Within this block, IFR is required and the airspace is fully controlled. Lowering the lower limit to surface or to a level like FL100 or FL200 would place portions of airspace outside Class A, and ending at a value other than FL600 would miss the actual top boundary.

Class A airspace is defined by its vertical boundaries: it begins at Flight Level 180 (18,000 feet) and extends up to Flight Level 600 (60,000 feet). This range is why the correct answer is FL180 to FL600. Within this block, IFR is required and the airspace is fully controlled. Lowering the lower limit to surface or to a level like FL100 or FL200 would place portions of airspace outside Class A, and ending at a value other than FL600 would miss the actual top boundary.

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