No, for two reasons.
First, it's ridiculous to charge extra for functionality that should be in the base product. It shouldn't require an addon for the AI to be able to use units that came with the base game.
Second, there is no way to quantify AI improvements. They could hand you an empty box and say, "this improves the AI," and there is no way you could prove them wrong.
What's really frustrating about the air combat AI is that, as far as I can tell, it has gotten worse over the course of the patches and expansion. Early on, the AI did use aircraft... not well, of course, but it did build fighters (and more rarely bombers) and use them for ground strikes. Then for a while it would build only a few, and just fly them from place to place without attacking anything. Now it doesn't seem to even build them anymore; it still occasionally builds aerodromes, but I don't think I've seen a single AI aircraft in the last 5 or 6 games I've played.
For that matter, I've noticed a pattern over the same span where many AI civilizations reach the industrial or modern era and have no army. There was a case in my last game where Poundmaker declared war on me and had literally zero land units. There may be a number of factors at play here, but I think the Corps and Army system may be largely to blame. I think it was intended to ease the pressure on the AI by allowing it to manage fewer units, but I think it has backfired... because the AI is poor at keeping its units alive, putting all its eggs into fewer baskets has made it easier for the AI lose them all.
But I digress...