Which airspace requires prior authorization before UAS operations?

Class B, Class C, and Class D airspace all require prior authorization before conducting UAS operations due to their varying levels of traffic density and complexity.

Class B airspace surrounds the largest and busiest airports in the United States. This airspace extends from the surface to a specified altitude and is designed to manage high volumes of air traffic. Because UAS operations could impact manned aircraft operations, prior authorization is mandatory to ensure the safety and smooth flow of air traffic.

Class C airspace encompasses airports with a significant amount of instrument traffic and a well-defined operational structure. Similar to Class B airspace, entering Class C requires coordination with air traffic control (ATC) to mitigate the risks associated with potential conflicts between UAS and manned aircraft.

Class D airspace similarly requires clearance before entry. While Class D typically covers smaller, controlled airports, it is still important for UAS operators to obtain authorization to avoid interference with aircraft in the vicinity, as well as to adhere to ATC directives.

In contrast, Class E airspace, while it may have specific conditions or requirements, typically does not require prior authorization for UAS operations unless additional stipulations are specifically noted. Class G airspace is uncontrolled and does not require any authorization, making