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.