I hadn't looked into this game before. What I can see looking on steam, the website and the forums it looks like it never really took off. I'm curious as to why? The reviews seem to either love or hate it. Didn't see many in the middle.
Well, that would be a whole long thread of it's own.

It was abandoned pretty early I think. It seemed abandoned for a long time at least. I doubt anything has been done to it beyond a few initial tweaks.
If I were King...
I would have had a completely different UI approach. Especially the initial landing screen. The game would have had a reasonable single player and single player campaign system. (The
AI stuff isn't there yet but that could have been extended. It would have been doable if that is the direction they would have chosen. It's code. )
It would have implemented the beginnings of a career mode. Needed for SP campaign and possibly applicable to a Tour of Duty online experience of the same gaming universe.
I would have had an online portion similar to the Staged Mission arena. Various fighter sweep, jabo, escort missions and you could fly one of your avatars, (You might be simultaneously managing multiple careers, one a carrier pilot, army fighter pilot, bomber pilot, transport pilot, etc. Some Axis some Allied. ) anyway you'd fly some part in the mission for the avatar career you wanted to advance. Etc. Earn rank and medals, etc.
Then you might have a side mosh pit furball lake practice arena sorta like what was implemented. But... I dunno that thing was whack. Did AI on your faction still attack you? Am I remembering that correct? It all seem like a confusing setup. I would have kept even the moshpit AvA. The AI would be AvA. So if you are US, you could reliably predict eh AI Zero was an enemy. etc. Whatever. It felt like it needed a lot of work but Definity should have only been a side practice arena.
Dump the micro-transactions.
Sell for fixed price ($14.95) and free online access. HTC has no shortage of un used-bandwidth and un-used server capacity at the moment. No need to be pennywise and pound foolish. And bandwidth is cheap. Sell it on Steam as a "value" priced sim. It also comes with a coupon for one free month on HTC premier WWII combat game Aces High. You get that for the purchase price of $14.95. Get it?

Anyway, I am not a King and ideas are a dime a dozen. They went a different way, but that didn't seem to have much potential.
$0.02.