I haven't.
Then again I never saw the necessity to do so. I mostly play campaigns against AI, which isn't particularly interested in naval or aerial battle, it seems.
Unless very late in the campaign they rarely use any arial units (zeppelins maybe) and then my ground units and/or dragon was sufficient to keep them in line.
Really? For some odd reason I always tend to get at least 1 AI that goes crazy with bomber balloons. It will make packs of them and bomb the ever loving hell out of anything that doesn't have AA. Once I cover everything with AA they switch up their builds but I have definitely seen the AI use air forces.
Naval units is what I've seen the AI not use much (they use transports a fair bit but they tend to avoid ironclads and juggs). Then again that one AI in Swens review stream was crazy about keeping a strong naval presence and would have won with a huge jugg fleet if he didn't use sneaky trooper rushes with capturing.
I think that the AI is definitely a fan of land forces but they are the meat-and-potatoes units of the game while naval/air tends to be more auxiliary. That said I have seen them use them so I suppose your experience is abnormal maybe? Or maybe Swen and I get all the luck with the smart combined arms AI
