The upper limit of the airspace should not exceed 10,000 feet MSL. However, high airport field elevation, adjacent high terrain, or operational factors may warrant a ceiling above 10,000 feet MSL.
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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.
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.
The upper limit of the airspace should not exceed 10,000 feet MSL. However, high airport field elevation, adjacent high terrain, or operational factors may warrant a ceiling above 10,000 feet MSL.
Such operations shall comply with paragraph (a) of this section. (c) No person may operate an aircraft in the airspace underlying a Class B airspace area designated for an airport or in a VFR corridor designated through such a Class B airspace area, at an indicated airspeed of more than 200 knots (230 mph).
Class D airspace is most often found starting at the surface and extending up to and including 2,500 feet within a radius of 5 statute miles from the primary airport.
In the 1900s, Hungarian physicist Theodore von Kármán determined the boundary to be around 50 miles up, or roughly 80 kilometers above sea level. Today, though, the Kármán line is set at what NOAA calls “an imaginary boundary” that's 62 miles up, or roughly a hundred kilometers above sea level.
Class B airspace is the most controlled airspace in the United States. It is located around major airports and has strict restrictions on drone flying. In general, it is prohibited to fly a drone in Class B airspace without permission from the FAA.
You may fly without ADSB under the Class B or Class C shelf provided you remain outside of any Mode C veil. §91.225 tells you where you cannot fly. It says you cannot fly within the lateral boundaries of the Class B or C airspace or above the airspace.
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 B Airspace RequirementsTo enter Class B airspace, all aircraft must meet the following requirements: ATC clearance required to enter. Establish and maintain two-way communication prior to entering and while in airspace. Mode C transponder (within 30 nm, up to 10,000 feet msl)