I’ve been on at least one Qantas 747.Given that they don’t have all that many I wonder if this is the one (or one of the ones) I’ve been on.
I'd bet they have one of the larger fleets; in fact I just looked it up...currently 34, but most of their equipment in the '80s were 747's
I've flown 'em both between L.A. and Sydney, Sydney and Perth and Singapore and Perth.