AS US airways is now part of OneWorld, the answer is Yes and Vica versa.
The other issue is luggage allowances and fees. This I dont know.
Generally as QF is the longest most significant sector the luggage allowance would be based on QF allowances but airlines have their own specific rules about this.
You may still be stuck with US airways luggage allowance though
I can definitely vouch for the QF to US scenario so even on separate pnrs you would receive the QF baggage allowamce 2 x 23kg to the final destination as well as get your US boarding passes.
I have no reason to believe US Air would not reciprocate in the reverse direction & would challenge them if they didn't.
The Frequent Flyer Concierge team takes the hard work out of finding reward seat availability. Using their expert knowledge and specialised tools, they'll help you book a great trip that maximises the value for your points.
From just $6 we'll remove all advertisements so that you can enjoy a cleaner and uninterupted viewing experience.And you'll be supporting us so that we can continue to provide this valuable resource :)