Some years ago I lived in Bundeena to the South of Sydney. When they changed the flight paths around Sydney, some rabble-rousers letter boxed the neighbourhood asking people to call the airport noise hotline (number supplied)and complain. This was in spite of the fact that the new DEP/ARR routes took aircraft away from the suburb! Their notice also contained a statement that when something like: "Even if the aircraft is not flying overhead, call and complain anyway. It's the only way that we will get the airport closed for good". This led me to think that it wasn't locals, but probably some activist group from the inner-city.The same people probably complain about 'chemtrails' and immunisation.