In my former life, I was mayor of a municipality, and we used to have what I call a bylaw of the senses, whether it was for sight lines or the smells or the noises. They are actually “sense-less” bylaws, in that they want less noise, less smell, and they don't want anything in the way of the sight lines.
Do you work with municipalities when they're going to develop an airport to help them with the planning? For instance, between agricultural operations and subdivisions we had a buffer of trees that was mandatory for the developer to put in, to get a break between the two conflicting land uses. Is there anything you have, or any influence you have on the municipalities as they develop the airports?