Quite right. SYD/PER-JNB is out under ETOPS regs for twins. So what are V Australia thinking here? maybe they are going to lease a couple of A340's or 744's :?: This is why Air Mauritius, SAA have A340's and LAN for that matter going the other direction.[/quore]
Boeing built the 777-300ER to meet ETOPS 330 minute requirements and
have proven its capability.
Of course there is no such certification currently, but Boeing are still pushing forward it for both the 777-300ER (and -200LR) and the future 787. And no doubt Airbus will want to support it for their A350 aircraft. I have no insight into any possible timeframes for such a certification, but 330 mins would make SYD-JNB accissible via the great circle route.
Under ETOPS 207 min rules (180 mins + 15%), SYD-JNB will be well within the endurance range for the 777-300ER via a more northerly routing.