Which airspace requires ATC clearance for all operations?

Class B airspace is designed to manage aircraft operations in busy terminal areas, typically surrounding major airports. This airspace is characterized by a high density of both commercial and general aviation traffic. As a result, ATC (Air Traffic Control) clearance is mandatory for all aircraft intending to operate in Class B airspace.

The requirement for ATC clearance ensures that all aircraft are accounted for and safely separated from one another, thereby minimizing the risk of mid-air collisions. Aircraft operating in this airspace must also adhere to specific procedural rules, including maintaining assigned altitudes and complying with ATC instructions to ensure organized and efficient operations.

In contrast, other classifications of airspace, such as Class C, Class D, and Class E, have varying requirements regarding ATC clearance. For instance, Class C airspace requires clearance but has certain exceptions for smaller aircraft and specific operating circumstances, while Class D airspace requires clearance specifically for operations in its vicinity. Class E airspace typically does not require ATC clearance for visual flight rules (VFR) operations, although it provides specific procedural guidelines for instrument flight rules (IFR) operations.