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.
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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 F airspace is technically designated as uncontrolled, but you can sometimes get ATC clearances as found in controlled airspace. ATC clearances in Class F are advisory only, meaning that you don't legally have to follow ATC directives, and the final responsibility rests with the pilot in command.
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.
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.
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.
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.
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.
Restricted areas denote the existence of unusual, often invisible, hazards to aircraft such as artillery firing, aerial gunnery, or guided missiles. Penetration of restricted areas without authorization from the using or controlling agency may be extremely hazardous to the aircraft and its occupants.
Since flying in restricted airspace is a federal crime, the FAA will charge you the big bucks for violating its drone laws. Each time you fly over restricted airspace, you'll have to pay a fine of $32,666. Keep in mind that just because these punishments could happen doesn't mean they will.
CBO operations and events occurring at 400 feet AGL and below in Class G airspace do not require FAA review, approval or authorization. CBO's intending to conduct events in Class G airspace that may exceed 400 feet AGL must contact the FAA for further information.
The U.S. aviation system is the safest in the world, but one close call is one too many. The FAA and the aviation community are pursuing a goal of zero serious close calls, a commitment from the Safety Summit in March. The same approach virtually eliminated the risk of fatalities aboard U.S. commercial airlines.