You won't earn AA ff points, but Virgin Blue
www.virginblue.com.au has flights between Sydney and Cairns today on their "Happy Hour" for AU$91.00 each way. Although you must travel between March 14 and April 14th 2009 on this particular special, they often have cheap flights Sydney Cairns on other days so it just means you have to work out 1pm Sydney time from where you are, and click on. The happy hour is indicated on the site from 12MD to 1pm, but as Sydney is now in Daylight Saving time it can be seen from 1pm to 2pm Sydney time, and is worth checking out. Qantas as usually a lot more expensive.