That is awesome! We might fly BNE-MEL (deliver the kids to my mother) and then on to the US! That would be cheaper than paying the unaccompanied minor component if we send them to her. What a mine of brilliant ideas AFF is. Thanks Mattg.
FWIW, MEL-BNE-LAX return on VA is around $30 more than BNE-LAX return.
VA even allow a free stopover in Brisbane. So you could fly MEL-BNE, stop for a week, then fly BNE-LAX. Return LAX-BNE only. The cost for that is $20 more than BNE-LAX return.