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If QF say not available not much we can do. They are QF seats.Thanks for response . i've been to the site . It seems almost impossible top get award seats back frm Santiago South America to Brisbane without a 34 hour flight thru Dallas or MIAMI
Really depends when you want to go and what class, what status you are etc. but QF are known for limited award availability. So going via the US isn't unusual. Maybe see if there's availability on LAN from Santiago, Chile back to Sydney which QF codeshares on. That would be less indirect.
You might want to call QF too, they can be quite helpful for enquiries but you'll be charged a fee for booking through them.