If the FP got sent to the destination (only), wouldn't they realise if you vanished somewhere?
Or is overdue action done only by enroute FIS offices?
What exactly does DEP do, on a VFR flight plan?
This is how I understand it... The departure message is sent to the destinaton aerodrome. Their AFTN system interrogates the message and adds the EET from the FPL to the departure time, giving an ETA. If the aircraft fails to arrive within 30mins of the ETA, overdue action is initiated. If the aircraft diverts, the alternate aerodrome must send an ARR message to the original destination to alert them that O/D action is not necessary as the aircraft has landed safely elsewhere.
I see your point. What is the purpose of distributing the DEP message to all of the addressees? Why not just send it to the original destination?