What airspace is IFR only?

Class A. IFR flights only are permitted, all flights are provided with air traffic control service and are separated from each other. Class B. IFR and VFR flights are permitted, all flights are provided with air traffic control service and are separated from each other.



In the United States, Class A airspace is the only environment that is strictly IFR (Instrument Flight Rules) only. Extending from 18,000 feet MSL up to and including Flight Level 600 (approx. 60,000 feet), this airspace is the "high-speed highway" for airliners and executive jets. To enter, a pilot must be instrument-rated, the aircraft must be equipped for IFR flight (including a Mode C or S transponder and ADS-B Out), and an explicit ATC clearance must be received prior to entry. VFR (Visual Flight Rules) flight is prohibited here because the closure speeds of aircraft are too high for "see and avoid" maneuvers to be effective. While other controlled airspaces (Class B, C, D, and E) allow for VFR flight under specific weather minimums, Class A remains a pure instrument environment where every single movement is monitored and separated by air traffic controllers to ensure safety at high altitudes and supersonic-like ground speeds.

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Flights. Aircraft within Class B airspace are required to operate in accordance with current IFR procedures.

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Class G airspace does not have the ATC control or support to fly on an IFR flight plan. You may, however, takeoff and land at a Class G airport. If you enter or fly through a Class G airspace, ATC control and support is terminated until you re-enter controlled airspace or close your flight plan.

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In theory, a pilot can operate in sub-VMC conditions under IFR without an ATC clearance in Class G airspace. However, to enter or operate in controlled airspace under IFR, an ATC clearance is required.

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Class G airspace is Uncontrolled Airspace. In class G airspace, operations may be conducted under IFR or VFR. ATC has no authority, but VFR minima are to be known by pilots. Traffic Information may be given by ATC as far as is practical in respect of other flights.

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IFR flying is astronomically more challenging than VFR flying, but those pilots who achieve this distinction are invariably more equipped to fly IFR and VFR. Aviating under IFR, a pilot is authorized to fly into clouds in what is called zero visibility. All of the VFR-pilot privileges also apply.

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You haven't flown through IMC without a clearance, have you? Technically, you can fly in IMC without a clearance in Class G airspace, because it's not controlled. Controlled airspace simply means you need a clearance to fly in the clouds. Class G airspace is uncontrolled, so it's not illegal to fly in the clouds.

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Like Class E airspace, you can fly through Class G airspace at airports (the terminal environment) and while en-route. However, Class G airspace isn't controlled. Neither VFR (Visual Flight Rules) nor IFR (Instrument Flight Rules) aircraft need an ATC clearance to operate in Class G airspace.

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It's important to remember that VFR and IFR are sets of rules that apply both to pilots and airplanes. Some airplanes will be equipped to fly using both, but others are only VFR equipped. It's important to double-check your plane and make sure you are properly equipped.

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The benefits of operating under IFR are numerous. Often the equipment on board allows for very precise flight along a route that is more direct than the twists and turns that might be required to dodge airspace and some weather under VFR.

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The two categories of airspace are: regulatory and nonregulatory. Within these two categories, there are four types: controlled, uncontrolled, special use, and other airspace.

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Class G airspace is the only uncontrolled airspace out there in the United States. Thus, both IFR and VFR traffic is also uncontrolled here. To find out Class G airspace, note that it exists where the other five airspace classes, i.e., Class A, B, C, D, or E, don't.

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It is that portion of the airspace that has not been designated as Control Area, Control Zone, Terminal Control Area or Transition Area. According to the airspace classes set by the International Civil Aviation Organization (ICAO), the uncontrolled classes of airspace are class F and G.

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You may enjoy flying now—but with an instrument rating, you will enjoy it more. Getting an instrument rating is, indeed, a lot of work, but it is mixed with fun. Flying on instruments is like solving a challenging crossword puzzle. It's a lot of effort, but it's deeply rewarding.

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The airline transport pilot (ATP) is the most advanced pilot certificate one can obtain, and it's necessary for those who want to fly commercial airliners for a living. All commercial airlines now require a pilot applicant to have an ATP certificate.

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