Here in Europe with maybe the most sophisticated regulation, we are allowed to go without alternate if you have 2 independend runways, its approach aids and a certain wx minimum.
RTFQ.
Answer does not address the original question...IE, OZ-land.
A "large international airline" most certainly does do this operating into Australia, operating using effectively a PNR between the destination and another airport above certain weather minimas... only if, at that point, the destination is above certain weather minima may you continue to destination.
This is generally refered to as 're-dispatch' or 're-release'...a different kettle of fish, altogether.