I have to do a quick self-funded trip to LA in June so will be booking on economy or discounted economy, but I'm hoping to upgrade in at least one direction and hopefully both. There are no award seats in J available around my needed dates, but fingers-crosses something will open up closer to the time of travel. I'm Melbourne-based, but if it increases my chances of getting an upgrade I'd be happy to route via SYD or BNE. Does anyone know which of LAX-MEL (QF94), LAX-SYD (QF12 or QF108) or LAX-BNE(QF16) has better upgrade chances?