After having spent over 20 hours with this game I have yet to see the AI send so much as a single air unit into battle against me. Is this a yet another bug? Its pretty much meaningless to play the game during the later eras if the AI doesn't build and use any air units since it gives the player a huge advantage and makes wars even easier then they already are. I should be noted though that I haven't played on anything harder then price (normal) yet, but that's hardly very relevant (or at least it should not be). Why doesn't the AI use air units?