Strange turn of events. I remember in the early 80's QANTAS was the only airline in the world who operated a purely all 747 passenger fleet. They are down to about a half dozen now I believe, and those are due to be phased out over the next few years.
Yes, sorry, this was back when TAA (which changed to Australian), Ansett etc. had the domestic market sewn up and QANTAS were doing purely international flights. (Though I believe they may have done some longer domestic routes like Perth-Sydney with 747s?!?).
When Australian Airlines was brought under the QANTAS wing and rebranded, then they went back to 737s, 767s, Airbuses etc. for domestic routes too.