Early last year there were some sales on QF (N/A web site) for LAX-MEL-LAX for about AUD1600 that suited me suspending my DONE4 in LAX from MAR - JUN. I thought about it one day too long and missed out. In the end I used 96,000 QFF points for WHY awards.

Luckily I ended up with a row of three seats to myself each way.

In retospect, the AUD1600 would have been the better option as I would have earned 90 SC's and over 31000 QFF points (as a QF WP, QF SG gets ~24000).

Until Jan 19th, you can book via the US QF web site LAX-SYD-LAX for travel in MAY/JUNE from about USD1167 (AUD1530) all in.