If the 300 really does knock 40 minutes off the sector it may be going direct on an ETOPS route. The 200 is just as quick as the 300 and cruises at the same mach numbers.
Does CASA realise that the ON airplane is ETOPS? Or maybe OJ is doing a refuel somewhere to get the payload but not telling the punters that on the schedule?
No argument the 300 is the better airplane, but see my previous post. If it was owned by most anyone else but Nauru it would probably be used. And we don't know what the OJ deal is - maybe they are taking all the commercial risk?