Overlapping Airspace

FAR 71.9 — Overlapping Airspace

FAR 71.9 explains which rules apply when airspace classes overlap: the more restrictive class wins. Study guide for pilot students prepping for checkride.

In Plain English

FAR 71.9 answers a simple but important question: when two airspace classes overlap in the same chunk of sky, which set of operating rules do you follow? The answer is the more restrictive class always wins.

The regulation establishes a clear hierarchy of restrictiveness, from most to least restrictive:

Class A is more restrictive than B, C, D, E, or G
Class B is more restrictive than C, D, E, or G
Class C is more restrictive than D, E, or G
Class D is more restrictive than E or G
Class E is more restrictive than G

Why this matters operationally: airspace boundaries frequently overlap — for example, Class E surface areas underlying Class B shelves, or Class D extending up into Class E. Rather than guessing which equipment, clearance, or weather minimum requirement applies, you default to whichever class sits higher on this list. This means stricter communication, clearance, equipment, and weather minimums govern your flight in the overlap zone. As a student pilot, knowing this hierarchy keeps you legal anywhere two classes meet on the chart.

Regulation Text

14 CFR § 71.9

§ 71.9 Overlapping airspace designations. (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 this section— (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.

Oral Exam Questions a DPE Might Ask

Q1If two airspace designations overlap, whose rules do you follow?

Per FAR 71.9, when airspace designations overlap, the operating rules of the more restrictive airspace apply.

Q2Which is more restrictive — Class C or Class D — and where would I see them overlap?

FAR 71.9 establishes that Class C is more restrictive than Class D, so in any overlap (such as a Class D satellite extending into Class C) the Class C rules govern.

Q3Rank Class B, D, E, and G from most to least restrictive.

Under FAR 71.9, the order from most to least restrictive is Class B, then Class D, then Class E, then Class G.

Practice this with our AI examiner

Examiner Reed adapts to your responses and probes deeper on weak spots — full ACS coverage, not a script.

Studying for a checkride?

FAR Library

Every section in plain English

Oral Exam Prep

AI examiner for every rating

Related Sections in Part 71

§ 71.1

Airspace Designations Applicability