I live in a very small coastal town on the south coast of NSW. I have never seen chem tails in my skies. I have seen them in other places though. We have planes that fly over regularly and they often leave con trails. I was just about to go for a siesta when I looked up from my bedroom. Right above I just saw a circular chem trail which looks very low. Above it are severla other straight and circular one. One blew me away the that the on that looks low is a near circle right above my house. I find that very strange. I wish I owned a mobile phone or a camera so I could take a photo and post it.