Thanks serfty
Actually I somewhat mislead with my question, trip is out QF127 17.11 and return QF128 24.11 which still shows J only both ways $4601 for J and $3637 for D . I presume this could be because 128 on 24.11 is A330 not 744 therfore split class fare not possible?
A one way search for 17.11 brings out the F seats
just cant be bought online in conjunction with J return I guess?