Because those units are always based within cities or airstrips. The visibility bonus wouldn't generally be noticable as your planes end the turn within your borders. (with the exception of airstrips, of course.)
Not to mention that they tend to fly so fast that the pilots can't really see much of anything as they pass. Certainly not much on the ground at any rate. And the cockpit is designed for inflight visibility, not recon. They'd pretty much have to fly upside down in order to really see the terrain below them.
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