I would give the crop duster a pass.....it's a lot different from the guy with the noisy lawnmower....he mows every week, while the crop duster is once, maybe twice?
I do agree on having respect and consideration for one's neighbors. I don't run equipment at the shop after hours or early in the morning, despite being zoned for commercial use. But a crop duster? Like Scott said, there's a tiny window of opportunity there.