I don't find noise a problem at all, except on Saturday nights with the Archerfield racing. But they hear it at Seventeen Mile Rocks as well.... all over by 10pm. I find Salisbury remarkably quiet and peaceful.
Salisbury is a mixed suburb. If you stick to the high side (most of the suburb) there shouldn't be a noise problem and it certainly won't come from Archerfield. This is an airport for small aircraft. The weekends are the noisiest with regards to aircraft. Most of your noise will come from the light industrial area, Rocklea/Salisbury/Coopers Plains.
Salisbury and Archerfield are about 6 mins drive apart, the airport at archerfield is a small one, no commercial planes of any sort really, They do flying lessons and some charter work but small twin engined prop stuff, there are NO jets at all. Hope that helps Albert