73Qanda, you gave the impression that QF and DJ aircraft carry an alternate. That is only the case when the weather at the destination requires an alternate. Otherwise, you arrive with your 2.5t and hope like hell when you're on final, the airport doesn't close.
That is exactly what happened at Mildura. Neither QF or DJ carried a true alternate, and both got caught out badly.
I am concerned that uneducated readers might think that "the big players in Australia" do carry alternates. They don't, as QF found out in their A330/CBR and A330/PER when the weather changed enroute a few years ago.
Snakecharma, I understand European rules require carriage of a "proper" alternate at all times ie fuel to get to your destination then to your alternate. Your problem then goes away.