Class G airspace rules govern flight in the uncontrolled portion of the national airspace system, where air traffic control provides no separation and issues no clearances. Pilots operating in Class G handle navigation and traffic avoidance themselves, subject to the VFR weather minimums in 14 CFR 91.155 and the general Part 91 rules on altitude, speed, equipment, and right-of-way that apply in every class of airspace.
Where Class G Begins and Ends
Class G is defined by exclusion: it is any airspace not designated as Class A, B, C, D, or E.1Federal Aviation Administration. Designation of Airspace Classes – Section: 14-1-3 Uncontrolled Airspace It starts at the surface and runs up to whatever controlled airspace sits above it.2Federal Aviation Administration. Aeronautical Information Manual – Class G Airspace
That ceiling is usually 700 feet AGL where an instrument approach serves a nearby airport, or 1,200 feet AGL where none does. In remote country with no nearby airways, Class G can reach all the way up to 14,500 feet MSL, where a blanket layer of Class E begins across the contiguous 48 states and Alaska.3eCFR. 14 CFR 71.71 – Class E Airspace Sectional charts show the floors of the overlying Class E with magenta and blue shading, and checking them before flight is the only reliable way to know where Class G actually ends over any given piece of ground.
Daytime VFR Weather Minimums
Day VFR in Class G is the most permissive regime in the airspace system, and the minimums shift with altitude.4eCFR. 14 CFR 91.155 – Basic VFR Weather Minimums
- At or below 1,200 feet AGL: one statute mile of flight visibility, clear of clouds. No specific vertical or horizontal cloud clearance is required.
- Above 1,200 feet AGL but below 10,000 feet MSL: one statute mile visibility, with cloud clearance of 500 feet below, 1,000 feet above, and 2,000 feet horizontally.
- At or above 10,000 feet MSL: five statute miles visibility, with cloud clearance of 1,000 feet below, 1,000 feet above, and one statute mile horizontally.
The clear-of-clouds standard at low altitude is unique to daytime Class G and is what gives pilots room to maneuver near the surface when a broken deck is sitting overhead.
Helicopters
Helicopters get looser numbers below 1,200 feet AGL during the day: half a statute mile of visibility while remaining clear of clouds. Within half a mile of a landing area in an airport traffic pattern, that half-mile visibility standard applies day or night. Above 1,200 feet AGL, helicopters follow the same rules as fixed-wing aircraft.4eCFR. 14 CFR 91.155 – Basic VFR Weather Minimums
Night VFR Weather Minimums
After sunset the low-altitude allowances tighten. Below 10,000 feet MSL, night VFR in Class G requires three statute miles of visibility and cloud clearance of 500 feet below, 1,000 feet above, and 2,000 feet horizontally, regardless of altitude band. At or above 10,000 feet MSL the daytime numbers carry over: five miles visibility and the wider cloud buffers.4eCFR. 14 CFR 91.155 – Basic VFR Weather Minimums
One narrow exception: at night, an airplane or powered parachute operating in an airport traffic pattern within half a mile of the runway can fly with one statute mile of visibility while remaining clear of clouds, provided visibility is at least one mile.4eCFR. 14 CFR 91.155 – Basic VFR Weather Minimums
Lights and Night Currency
Between sunset and sunrise every aircraft must display lighted position lights, and any installed anti-collision light system must be operating unless the pilot determines safety requires turning it off.5eCFR. 14 CFR 91.209 – Aircraft Lights Carrying passengers at night also requires the pilot in command to have made three takeoffs and three full-stop landings in the same category and class of aircraft during the period from one hour after sunset to one hour before sunrise, within the preceding 90 days.6eCFR. 14 CFR 61.57 – Recent Experience: Pilot in Command The rule applies everywhere, but it gets overlooked in Class G because the absence of ATC makes the operation feel less regulated.
IFR Without a Clearance
Flying IFR in Class G is legal, and no flight plan or ATC clearance is required. The regulation mandating both applies only to controlled airspace.7eCFR. 14 CFR 91.173 – ATC Clearance and Flight Plan Required An instrument-rated pilot in a properly equipped aircraft can depart into instrument conditions from a non-towered airport in Class G without contacting anyone.
The tradeoff is that ATC provides no separation. Two IFR aircraft at the same altitude in the same patch of Class G have no one keeping them apart. The pilot alone is responsible for terrain clearance and traffic avoidance. Where no published minimum altitude exists, the regulatory floor is 1,000 feet above the highest obstacle within four nautical miles of the route, or 2,000 feet in designated mountainous areas.8eCFR. 14 CFR 91.177 – Minimum Altitudes for IFR Operations Most IFR flights pick up a clearance as soon as they climb into overlying controlled airspace, but the uncontrolled segment during departure is where the pilot has the least protection.
Transponder and ADS-B Out
Class G itself does not require a transponder or ADS-B Out. The equipment mandates key off altitude and proximity to busy airports, not the airspace classification.
A transponder with altitude reporting is required at or above 10,000 feet MSL in the contiguous 48 states, except for aircraft operating at or below 2,500 feet AGL. It is also required within 30 nautical miles of any airport listed in Appendix D to Part 91, from the surface up to 10,000 feet MSL. That 30-nautical-mile ring is the Mode C veil.9eCFR. 14 CFR 91.215 – ATC Transponder and Altitude Reporting Equipment and Use Pockets of Class G tucked beneath Mode C veils near major metro airports still require a working transponder even though the airspace is uncontrolled.
ADS-B Out follows the same geographic pattern: within Mode C veils, above 10,000 feet MSL in Class E, and within or above Class B and C airspace.10eCFR. 14 CFR 91.225 – Automatic Dependent Surveillance-Broadcast (ADS-B) Out Equipment and Use Aircraft never certificated with an engine-driven electrical system, along with balloons and gliders, are exempt from both requirements as long as they stay outside Class B and C and below the ceiling of those areas or 10,000 feet MSL, whichever is lower.11Federal Aviation Administration. Aeronautical Information Manual (AIM) – Paragraph 4-1-21(f)
Speed and Minimum Safe Altitudes
Below 10,000 feet MSL, no aircraft may exceed 250 knots indicated airspeed without specific FAA authorization.12eCFR. 14 CFR 91.117 – Aircraft Speed The limit applies in Class G just as it does anywhere else. Light piston aircraft rarely test it; turbine aircraft descending through low-altitude Class G have to plan for it.
Minimum safe altitude rules also travel with the aircraft into uncontrolled airspace. Except during takeoff and landing, every flight must be conducted at an altitude allowing an emergency landing without hazard to people or property on the ground. Over congested areas, the floor is 1,000 feet above the highest obstacle within a 2,000-foot horizontal radius. Over non-congested areas the floor is 500 feet AGL. Over open water or sparsely populated terrain, the aircraft must stay at least 500 feet from any person, vessel, vehicle, or structure.13eCFR. 14 CFR 91.119 – Minimum Safe Altitudes: General Helicopters, powered parachutes, and weight-shift-control aircraft may operate below those minimums under specified conditions.
Non-Towered Airport Operations
Approaching an airport without an operating control tower in Class G, powered fixed-wing aircraft must make all turns to the left unless the airport displays approved visual markings or light signals directing a right-hand pattern.14eCFR. 14 CFR 91.126 – Operating on or in the Vicinity of an Airport in Class G Airspace Segmented circles and traffic pattern indicators on the ground show when the pattern differs.
Right-of-way runs by category, not just position. When two aircraft of the same category converge at roughly the same altitude, the aircraft to the other’s right has priority. Across categories, the less maneuverable aircraft wins: balloons over everything, gliders over powered aircraft, and airships over airplanes and rotorcraft. Aircraft towing or refueling another aircraft have priority over all other engine-driven aircraft. In a head-on encounter, both pilots alter course to the right. An aircraft being overtaken always has the right-of-way, and the overtaking aircraft passes to the right.15eCFR. 14 CFR 91.113 – Right-of-Way Rules: Except Water Operations
Radio
No regulation requires radio use in Class G. The FAA recommends self-announcing position and intentions on the Common Traffic Advisory Frequency beginning at least 10 miles from the airport. The CTAF for each field is published in the Chart Supplement and on instrument approach charts.16Federal Aviation Administration. Aeronautical Information Manual – Chapter 4 Air Traffic Control A useful self-announce carries the airport name, aircraft type and call sign, position, altitude, and intentions. Listening matters as much as transmitting.
Special VFR Is Not Available in Class G
Special VFR clearances cannot be issued in Class G. They exist only within the lateral boundaries of controlled airspace designated to the surface for an airport, which means Class B, C, D, or surface-area Class E.17eCFR. 14 CFR 91.157 – Special VFR Weather Minimums In Class G the basic VFR minimums are the floor. If weather drops below them, the choices are to stay on the ground, fly IFR with the required rating and equipment, or use one of the narrow reduced-visibility exceptions inside an airport traffic pattern.