Aviation reference number (ARN)

A unique six-digit number used to identify a client who conducts business with CASA. When CASA receives an application for a new licence, certificate, or other service, an ARN is established and all subsequent transactions for the client are recorded against that ARN. In addition to being a client number, the ARN can also be the licence or certificate number. The ARN should be quoted in all correspondence with CASA or with the Airservices Publications unit.

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