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The Pilots Desk
US-FAA14 CFR 71.31

Class A airspace

Read the official rule

This regulation establishes that Class A airspace—defined in § 71.33 and FAA Order JO 7400.11K—is subject to specific requirements found in Part 91 of the regulations.

In practical terms, this means when you fly in Class A airspace (generally 18,000 feet MSL up to FL600), you must comply with Part 91's rules for that airspace class. These include:

  • Operating under IFR (no VFR flight permitted)
  • Having an instrument rating and being instrument current
  • Obtaining an ATC clearance before entering
  • Meeting specific equipment requirements (such as Mode C transponder)
  • Following all ATC instructions

This regulation matters because it's the legal foundation that makes Class A airspace the most restrictive airspace class in the National Airspace System. It ensures all aircraft operating at these higher altitudes are properly equipped, pilot-qualified, and under positive ATC control for safety and traffic separation.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*

This is an original plain-English explanation for training and reference, not legal advice and not for navigation. Always rely on the current official rule linked above. Last reviewed June 20, 2026.