Which type of airspace is UAS prohibited from flying in unless a waiver is obtained?

Prohibited airspace and Restricted areas are designated for safety and security reasons, making them highly controlled environments where unauthorized entry is not allowed without specific permissions. In the case of UAS operations, this means that any flight activity in these areas requires a waiver from the appropriate authorities. Prohibited airspace is generally off-limits to all aircraft except those specifically authorized, such as military operations, and flying a UAS into restricted areas without proper approval poses significant risks not only to the drone itself but also to other aviation operations and national security.

This understanding is crucial for remote pilots, as operating in these areas without permission can result in severe penalties and endanger public safety. Conversely, the other options like Class B airspace, Class G airspace, and Flight Information Regions do have their own operational requirements but are not outright prohibitions against UAS operations, as they can often be navigated with proper communication and adherence to regulations.