Birdland seems to raise the best point so far, about only Nazgul Controlling a Fell Beast, as to why Sauron didn't have an Air Force.
I don't think time would have been much of a factor against, Sauron was immortal, and could launch his full assault any time he felt ready. Well, except for the fear of someone strong enough using the ring against him. So maybe he had drop a few strategies and tactics that may have landed him a sure victory, had he not felt pressured about the ring.
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