Hi Anthony,
As I said, most of the flights are done by the regionals. Yes, I work for one of the QF regionals. I don't know how you can stipulate what plane you fly on, I guess look up their flight schedulers.
I can't offer jumpseats and as far as I am aware you just have to buy a ticket. If it is an ID one, then you are on standby and can get "bounced". I would try and contact someone in Flight Ops (either QF or AN) with your request and see how you go.
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reddo...feral animal!