Class Bravo airspace (Class B) is that airspace surrounding the nation's busiest airports. Class B airspace supports both Instrument Flight Rules (IFR) and Visual Flight Rules (VFR) operations within.
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Class B is a class of airspace in the United States which follows International Civil Aviation Organization (ICAO) airspace designation. Class B airspace areas are designed to improve aviation safety by reducing the risk of midair collisions in the airspace surrounding airports with high-density air traffic operations.
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]).
Automatic Dependent Surveillance–Broadcast (ADS–B) is an advanced surveillance technology that combines an aircraft's positioning source, aircraft avionics, and a ground infrastructure to create an accurate surveillance interface between aircraft and ATC.
B - Economy/Coach – Usually an upgradable fare to Business. C - Business Class. D - Business Class Discounted. E - Shuttle Service (no reservation allowed) or Economy/Coach Discounted. F - First Class.
A Class B Airspace VFR Transition Route is defined as a specific flight course depicted on a TAC for transiting a specific Class B airspace. These routes include specific ATC-assigned altitudes, and pilots must obtain an ATC clearance prior to entering Class B airspace on the route.
Class B airspace — Unrestricted at or above 10,000 feet msl, 250 kias below 10,000 feet msl. Beneath Class B or in VFR corridor through Class B — 200 kias. Procedure turn — 200 kias.
Airspaces colored yellow on the map will also be colored yellow in the airspace advisory bar on the right (desktop) or below (mobile). This indicates that drones may be allowed in this airspace but to first check the airspace advisory bar for further detail and to use caution during operations in this airspace.
As described in 14 CFR 91.225, ADS-B Out performance is required to operate in: Class A, B, and C airspace. Above the ceiling and within the lateral boundaries of a Class B or Class C airspace area upward to 10,000 feet MSL .
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.
Class B airspace surrounds the busiest airports from the surface to 10,000 feet MSL. The dimensions of Class B airspace vary depending on the needs of the airport. Class C airspace extends from the surface to 4,000 feet MSL.