Who is responsible for canceling an ALNOT once it is no longer active?

The responsibility for canceling an Alert Notice (ALNOT) once it is no longer active falls to the ALNOT originator. This individual or organization is typically the one who has the most knowledge of the situation that prompted the issuance of the ALNOT in the first place. Once the situation that led to the issuance is resolved—such as the missing aircraft being located or communication being reestablished—the originator is tasked with formally canceling the alert to prevent unnecessary search and rescue efforts from continuing.

To add context, ATC personnel on duty, while they play a vital role in monitoring and responding to alerts, do not have the authority to cancel an ALNOT. Similarly, the RCC coordinator may assist in managing the response to the alert but does not hold the responsibility for cancellation. The nearest airport authority is also not in a position to cancel an ALNOT, as they do not have the necessary information regarding the situation that would allow them to determine if the alert is still valid or has been resolved. Thus, it's essential that the ALNOT originator takes the necessary action to ensure all parties are informed when the alert is no longer needed.