I stopped playing Fighter Ace, 3 years ago, mainly due to player numbers and lack of development.
The current version stems from what was released in January 2002 and not much has changed since.
It's a ghost town. The only things going for it are the events at the weekend and instant action. Takes less time to get into a fight than AH. The water does look pretty compared to AH and the explosions. No skins from the default ones though and the terrain is generic patchwork.
wolf, If you were to take the very best 6 guys from there against 6 from AH I wouldn't want to place any bets. In a KOTS setup the guys from FA would win because of team tactics. Indivadually the AH guys would win due to a better flight model. However, long gone are the best FA sticks and squadrons. Drifted to other fantasy games, FPS'ers or ended up here.
I think if I re-activated my account today I would still easily be in the top ten (on the leaderboard). Only reason the hanger ons are still there in my opinion because of their precious scores. If they reset them, the game would die.
They added the Korean jets recently and i'm sure they are fun for some it just isn't going to turn the game around. If you don't want to spend hours mastering the AH learning curve FA maybe the easier option.