What evidence do you have that this operation was in place before the complainants moved into the area?
Bit unrealistic to expect a Canadian to know the exact circumstances of one airfield in Australia.
The skydiving operation has been at Tyagarah for 20 years, the airfield is about 43 years old. Average age of first home owner being 30, would put the average complainant who bought before the airfield was opened in their 70s...
I can't exactly see a 70+ year old inflicting what has been done here?