From James Strong's comments on page 3 of the QANTAS/AUSTRALIAN timetable effective 28 March 1993:
"Effective from Sunday, March 28, the timetable introduces the progressive interchange of aircraft within our enlarged fleet, allowing us to offer customers a greater choice of flights.
We are scheduling Qantas Boeing 767 aircraft to provide additional frequencies on long-haul Australian Airlines routes between Sydney-Perth and Sydney-Cairns. Offering a three class service in a wide-body aircraft, these flights operate to and from domestic terminals in each city."