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.
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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.
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.
Class D is used for smaller airports that have a control tower. The U.S. uses a modified version of the ICAO class C and D airspace, where only radio contact with ATC rather than an ATC clearance is required for VFR operations.
No person may operate a small unmanned aircraft within the lateral boundaries of the surface area of Class E airspace designated for an airport unless that person has prior authorization from Air Traffic Control (ATC)
Class G airspace (uncontrolled) is that portion of airspace that has not been designated as Class A, Class B, Class C, Class D, or Class E airspace. Rules governing VFR flight have been adopted to assist the pilot in meeting the responsibility to see and avoid other 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. Class F is not used in the United States. In Canada, Class F is the equivalent of U.S. special use airspace including restricted and alert areas, while ICAO defines it as a hybrid of Class E and Class G, in which ATC separation guidance is available but not required for IFR operation.
E - Shuttle Service (no reservation allowed) or Economy/Coach Discounted. F - First Class. G - Conditional Reservation. H - Economy/Coach Discounted – Usually an upgradable fare to Business. J - Business Class Premium.
Class E airspace exists to provide added protection for the separation of IFR and VFR aircraft. It creates a type of airspace in which VFR pilots do not need special clearances, but IFR pilots do.
Class E Airspace, indicated by the faded magenta line. Most of the airspace in The United States is Class E airspace. Class E airspace extends from 1,200 feet AGL to 17,999 feet MSL (18,000 feet is the floor of Class A airspace). Class E airspace can also extends down to the surface or 700 feet AGL.
Class C airspace is designed to establish and maintain safe separation of mixed general aviation and airline traffic. It is usually upside-down wedding cake shaped and depicted on charts with two bold magenta rings along with numbers indicating the airspace floor and ceiling within each ring.
The FAA requires that all aircraft obtain ATC approval prior to entering Class D airspace. Approval is given by the ATC facility that provides ATC services for the designated airspace. This is usually the local tower at a controlled airport.
Class D airspace: No transponder is required unless otherwise specified by ATC (Pilots only require two-way radio communication in this class of airspace).