Same here...
As for time, 4-6 weeks after the end of the offer is November (the only downside really)
AAMI also has 10x bonus points, offer requires registration :D
I've had a stopover in SYD offered on an oversold flight through to LAX...but, other than that case, I don't think it's possible.
Would be worth doing though, the flight is 3/4 empty. I wouldn't fly to LAX again with them though :!: