Within these two categories, there are four types:
Controlled.
Uncontrolled.
Special use.
Other airspace.
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A generic term that covers the different classification of airspace (Class A, Class B, Class C, Class D, and Class E airspace) and defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspace classification.
In a Class E transition area, the Class E floor drops down to 700 feet AGL. On a sectional map, you can find these transition areas by looking for a broad, magenta line that is fuzzy on the inner side. It often surrounds individual airports or groups of airports.
There are two categories of airspace or airspace areas: Regulatory (Class A, B, C, D, and E airspace areas, restricted and prohibited areas). Nonregulatory (military operations areas [MOA], warning areas, alert areas, controlled firing areas [CFA], and national security areas [NSA]).
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.
Uncontrolled airspace or Class G airspace is the portion of the airspace that has not been designated as Class A, B, C, D, or E. It is therefore designated uncontrolled airspace. Class G airspace extends from the surface to the base of the overlying Class E airspace.
The purpose of Class C airspace is to enhance aviation safety in the terminal area and to decrease the risk of midair collisions by providing traffic separation service.
Class Charlie (also referred to as Class C) Airspace areas are designed to improve aviation safety by reducing the risk of midair collisions in the terminal area and enhance the management of air traffic operations therein.
Class B Airspace AltitudeIn some high-altitude airports like Denver, the Class B ceiling extends up to 12,000 feet MSL. Atlanta is another example of an irregular Class B airspace ceiling altitude. Due to the high volume of air traffic, the Class B ceiling in Atlanta reaches up to 12,500 feet MSL.
Class C airspace areas should initially be designed as two concentric circles centered on the airport reference point. The surface area should have a 5 NM radius, and the outer limits of the airspace area should not extend beyond a 10 NM radius.
There are six classifications of airspace in the United States; A, B, C, D, E, and G. Class A is the most restrictive and Class G the least restrictive. They can be categorized as: Class A – 18,000 feet and higher above mean sea level (MSL).
The main requirements for operating within Class D airspace are to have a functional two-way radio and to establish two-way communication with ATC prior to entering the airspace. Pilots must also meet all of the established weather minimums and obey speed regulations.