Also, I have just remembered this from the fare rules
ALL OTHER CODESHARE FLIGHTS ARE NOT PERMITTED WITH THE EXCEPTION OF QF CODESHARE SERVICES OPERATED BY AIR TAHITI NUI-TN
QF has a codeshare on TN PPT-AKL
So you could fly IPC-PPT-AKL-SYD instead of IPC-SCL-SYD
It does take one extra segment, but you get Tahiti and New Zealand