I was patiently waiting for this offer to come up again!
Thanks to this forum I was able to book Business Class to LA from Perth on cx for 5 people!!
We are mixed class going to Hong Kong and Back but the long legs from Hong Kong to LA and return we are all in Business class.
Alaska allowed me to do mixed class so we are in Business/Premium economy and economy up to Hong Kong from perth then Business & Premium Economy back to perth fron Hong Kong.
So thanks for everyone's help!
Also as a tip, I booked my husband and infant together using my Qantas points for total cost of 278,000 points and $1300 rather than buying 120,000 alaska miles and paying 10% of the fare from my infant which equated to total cost of around $4500 (alaska buy cost + infant fare and taxes).
So bring on October/November!!!