The game's so poorly known that when I first downloaded it, I assumed it was one of those cult-following-only games, simply because I couldn't find much documentation at all for it. It was only when I happened across it from another website a year later that I realised I was wrong.
I just googled "Aces High II", and looked at IGN's and GameSpy's pages for AH. IGN doesn't mention any updates to the game since 2003, and GameSpy contains an update for 2004. Quite frankly, I'm not surprised this game seems to have only about 5,000 active players - the third-party sources about AH suck.
Oh, and Gamespot actually has images and updates from 2006. Amazing!