Birds also fly routes, not to say they are wrong, but they were there first. I do get the worry about birds and engines. I was sort of born (teethed next door to army air force base) being used to airplanes, so I tend to give them a pass. But, first come, first serve.
I'm a person who doesn't like various things in the sky. Balloon festivals are one of them. I know, I know, I'm a crank. I like my sky clear, if not always blue. The concept of Amazon sending stuff by drone annoys me. I also whined somewhere in early a2k against art in the sky over the Hudson River (I think it was). I consider that - trying to pick the right adjective: egregious, plus annoying. I flip flopped on other "landscape art" stuff, get some of it, appreciate it; crabby about some of it.
http://www.thesaurus.com/browse/egregious (I've never been sure what that word means - I read it used differently by varied people)