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AirspaceQuestion 132 of 934

What are the general vertical limits of Class A airspace?

  1. From the surface up to 18,000 feet MSL
  2. From 14,500 feet MSL up to and including FL 450
  3. From 10,000 feet MSL up to and including FL 600
  4. From 18,000 feet MSL up to and including FL 600
Show answer

Correct answer: From 18,000 feet MSL up to and including FL 600

Class A airspace starts at 18,000 feet MSL and goes up to and including FL 600.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 3-2-2 Class A Airspace, page 179

Practice airspace

Questions last reviewed: 18 October 2026