In other countries, such as Canada, Class F airspace is marked on both VFR and IFR charts. There, class F airspace includes alert areas, danger areas, rocket ranges, restricted areas, forest fire restrictions, and military active areas.
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Class F airspace.Airspace of defined dimensions within which activities must be confined because of their nature, or within which limitations are imposed upon aircraft operations that are not a part of those activities, or both. Special use airspace may be classified as Class F advisory or Class F restricted.
Flight operations may be conducted under IFR or VFR, and ATC separation will be provided to aircraft operating under IFR, so long as it's practical. Class F airspace is not, however, used in the United States.
The point of having an F airspace is that the visibility requirements are different for VFR aircraft, where you have to stay a mile away/thousand feet from clouds, whereas in G they only need to stay clear of clouds.
Where available, ATC may give separation guidance to IFR aircraft. In short, the real purpose of Class F is to allow flights to remain IFR in uncontrolled environments. Since this is a sort of mix between Class E and Class G airspace, there is no Class F inside the United States.
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.
Uncontrolled airspace (class F & G)5 km flight visibility, 1500 m horizontally from cloud, 1000 ft (300m) vertically from cloud. or, for an aircraft, other than a helicopter, operating at 140 kt or less: 1,500 m flight visibility, clear of cloud and in sight of the surface.
For the purpose of clarification: Class A airspace is more restrictive than Class B, Class C, Class D, Class E, or Class G airspace. Class B airspace is more restrictive than Class C, Class D, Class E, or Class G airspace.
It houses the president of the United States and his administration along with highly protected national intelligence. In fact, ever since the 9/11 terrorist attacks, the entire DC area is considered National Defense Airspace (NDA) and is the most restricted airspace in the country.
Class E “Everywhere” Airspace. Echo airspace is the most common type of airspace you will encounter, no matter where it is you fly in the country. You will find Echo airspace below 18,000' msl everywhere that either Class B, C, D, or G airspace does not occupy.
You must receive official clearance. Also, pilots must hold a minimum of a private pilot certification to enter Class B airspace. Sport pilots, recreational pilots, and student pilots are not authorized to operate in Class B airspace.
Private pilots can technically land at any commercial airport, subject to the approval of air traffic controllers. However, major airports such as Heathrow, JFK, and LAX are often busy with commercial airline traffic, making it less likely for private pilots to attempt landing their smaller aircraft there.
Class A airspace is generally the airspace from 18,000 feet (~3.4 miles, 5.5 km) mean sea level (MSL) up to and including flight level (FL) 600 (~11.4 miles, 18.3 km), including the airspace overlying the waters within 12 nautical miles (NM) (~13.8 miles, 22.2 km) of the coast of the 48 contiguous states and Alaska.
Warning areas, MOAs, alert areas, CFAs, and national security areas (NSA) are nonregulatory special use airspace. Special use airspace descriptions (except CFAs) are contained in FAA Order JO 7400.10, Special Use Airspace.
You should advise ATC before any altitude change when operating VFR-on-top. This ensures ATC can provide accurate traffic information and separation. VFR-on-top is not permitted in Class A airspace.
In class E airspace, IFR aircraft are controlled by ATC.This might be a center facility (Air Route Traffic Control Center) or approach/departure facility. As a VFR aircraft, you aren't required to be in contact with ATC, but IFR aircraft must operate on an ATC clearance. That means the airspace is controlled.