Just a few things that I think would make the arena better if HTC hasn't already implemented them.
1. New Airfields, basically just dirt strips with tent hangars for small ones. Not really sure how you could basetake, I'm guessing a troop truck or something of the sort that can be strafed?
2. Along the 3 lines (or 2, not sure how HTC wants to do it this time), there's trenches, and a "no mans land" (again, could work if there isn't any base taking) that the planes could fly and fight over, and they moved as the bases moved if there's base taking.
That's about it off the top of my head, tell me what you think.