How should you prefix a clearance that will be relayed through a non-facility?

When relaying a clearance through a non-facility, the appropriate way to prefix the message is by stating "ATC Clears." This phrase is critical as it establishes the context of the communication as an official clearance issued by Air Traffic Control.

Using "ATC Clears" indicates to the receiving party that the information being relayed is not just advisory in nature but an actual directive that must be followed, which reflects the authority of the ATC. This ensures that the recipient understands the clearance is essential for compliance regarding flight operations.

In contrast, phrases like "ATC Requests," "ATC Advises," and "ATC Sends" do not convey the same level of authority as a clearance. "ATC Requests" implies that the information is a suggestion or request rather than a directive. "ATC Advises" suggests that the information is merely advisory and may not require compliance. "ATC Sends" is ambiguous and does not sufficiently communicate that the information being relayed is a clearance that must be acknowledged and followed. Therefore, "ATC Clears" is the clear choice to communicate a clearance properly.