AIM 3-1-3 Hierarchy of Overlapping Airspace Designations
Chapter 3. Airspace · Section 1. General
A reference copy of the official AIM text for study. It is not legal advice or an FAA interpretation; always confirm against the current official source.
a. When overlapping airspace designations apply to the same airspace, the operating rules associated with the more restrictive airspace designation apply.
b. For the purpose of clarification:
1. Class A airspace is more restrictive than Class B, Class C, Class D, Class E, or Class G airspace;
2. Class B airspace is more restrictive than Class C, Class D, Class E, or Class G airspace;
3. Class C airspace is more restrictive than Class D, Class E, or Class G airspace;
4. Class D airspace is more restrictive than Class E or Class G airspace; and
5. Class E is more restrictive than Class G airspace.