QF domestic has been split from International and therefore is not bound by the QF sales act or its protections.
That is just a myth and you will find that any attempt to sell Domestic as a whole would be greeted by the same resistance as would any full sell off of international. It's still covered under Qantas Pty Ltd as defined in the Qantas sales act.
The split is more about bean counters and tax.
I agree with the above re the integration award, it is clutching at straws to think Jetstar or any of the other entities would have a bearing on it.