With respect, cancelling their flight plan and sending an ARR message are two totally different things.
I think the correct procedure is for the pilot nominate a responsible person to initiate overdue action if they fail to arrive within 30 minutes of their FPL ETA. The FPL is automatically 'closed' when the responsible person is aware that the pilot has arrived safely.
Last edited by callum91; 22nd Aug 2013 at 21:01.