How can I stop a dog from barking at airplanes?

We took in a 120 lb lab mix last November. Since we are spending more time outside this summer, I noticed that he barks at airplanes. When he'd bark in the house at "virtually" nothing, I have now realized it is the airplanes flying overhead. (We are four miles from a small city airport) Aside from... show more We took in a 120 lb lab mix last November. Since we are spending more time outside this summer, I noticed that he barks at airplanes. When he'd bark in the house at "virtually" nothing, I have now realized it is the airplanes flying overhead. (We are four miles from a small city airport)
Aside from moving, how can I get him to stop barking at them?
Telling him "no" just isn't enough to get his attention.
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