FAR 91.101 — Flight Rules Applicability
FAR 91.101 sets the scope of Part 91 Subpart B flight rules, applying to aircraft operations in the U.S. and within 12 NM of the coast.
FAR 91.101 is the opening section of Subpart B — Flight Rules in Part 91. It simply tells you where the flight rules in this subpart apply.
The rules in Subpart B govern aircraft operations:
- Within the United States, and
- Within 12 nautical miles from the U.S. coast (out over coastal waters).
Why it matters operationally: Subpart B contains the meat of the rules you fly by every day — VFR and IFR weather minimums, right-of-way, altitudes, fuel requirements, and more. Section 91.101 is the jurisdictional anchor that puts you on notice that these rules apply not just over land, but also out to 12 NM offshore. Beyond 12 NM, ICAO rules generally take over. Knowing this boundary helps you understand which set of rules controls your flight, especially when operating near or over coastal waters.