The phrase "ATC CLEARS" is required in clearances relayed through what medium?

The phrase "ATC CLEARS" is specifically utilized when a flight clearance is being relayed through an airline dispatch office. This phrase emphasizes that the clearance is coming directly from Air Traffic Control (ATC) and holds official status for the specific aircraft.

When operating in the aviation environment, it’s crucial for pilots and dispatchers to understand the source of their clearances. The term serves to clarify that the instructions or approvals the dispatcher is providing have originated with ATC, thus ensuring the pilots are acting on valid, authorized information. In contrast, communications through flight service stations, ground control stations, or directly from a flight's own dispatcher do not require this specific language, as they may not represent an official ATC clearance. Hence, understanding the context and source of clearances is vital for ensuring safe and compliant flight operations.