I doubt there is a shortage of eyes looking out airyplane windows at any given time in Victoria, and connected by wireless to help
One of the problems with reporting though the aviation comms system is the time that it takes the message to reach the brigades that deal with it. I'm sure the situation has improved dramatically now, but back in the mid 90's I reported one fire in summer on the beginning of a scenic flight that was in my local brigade area. I continued on the flight, landing about half an hour later. As I walked the guests back into the office my pager went off - first page for that fire from my call. After that experience I always used the mobile when I could.
Specific locations are critical - I also remember one fire report from an airliner on approach into ML. The location - somewhere in the Grampians - an area 100km long by 50km wide.
On bad days CFA/DSE put up aircraft on patrol to spot fires that have just started, in addition to their tower network.