Perhaps install noise abatement screens along all private dwellings abutting the airfield at Wells Ave & Avro Rd which are closest to TWY C.
Although, don't be surprised is alleged compainants allege violations to right to light.
I'd sooner let a case run through the courts and takes your chances. At the end of the day, there are mitigating factors in this situation. Airfield predates dwellings. Private resident occupants who allegedly are the source of a complaint, seem to have entered into a wilful decision to purchase and reside at the property in full knowledge of proximity to an active commercial airport. Additionally, it's alleged they worked at said airfield. Legally is a closed book. Run a case, set precedent, move on.