Technically failing to fly one of the Atlantic/Pacific ocean crossings invalidates the xONEx fare and it can be recalculated as point to point and charged back to your TA (if purchased through a TA). In practice this rarely happens unless the airlines have you pegged for some other abuse; but it is not a good idea to plan on throwing away segments on this fare type, particularly the trans-oceanic segments, as it is against the conditions of carriage and does get monitored. It is particularly ironic that you are tying up not one but *2* of the impossible to get SCL-SYD seats and not intending to use them ... maybe the hardest to get, most desirable and sought after seats in the Oneworld network. Sadly they will go unused as LA doesn't overbook this flight (or so I've been told; usually it is weight limited so they just put on extra cargo when pax no-show).