Class A airspace extends from which altitude to which?

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Multiple Choice

Class A airspace extends from which altitude to which?

Explanation:
Class A airspace is the high‑altitude, fully controlled airspace where all operations require ATC clearance and IFR rules. It starts at 18,000 feet above mean sea level and extends up to and including flight level 600 (60,000 feet). The lower boundary at 18,000 ft MSL keeps the lower airspace under other classes, while the upper boundary uses flight levels to standardize reference pressure at high altitude. The other options mix in lower starting points or lower upper limits, which don’t match this designated high‑altitude block.

Class A airspace is the high‑altitude, fully controlled airspace where all operations require ATC clearance and IFR rules. It starts at 18,000 feet above mean sea level and extends up to and including flight level 600 (60,000 feet). The lower boundary at 18,000 ft MSL keeps the lower airspace under other classes, while the upper boundary uses flight levels to standardize reference pressure at high altitude. The other options mix in lower starting points or lower upper limits, which don’t match this designated high‑altitude block.

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