So there is variation not just by weapon, but also on the exact round being fired. Yes on both counts. What are your plans for the view system. An unlimited number of view keys, buttons and hats can be mapped to suit the player. Both external and padlock views exist, but each server operator can decide whether or not players can use them while flying on that particular server.
Lets switch gears and talk a bit about the environment.
Yes, eventually there will be a dynamic ground war in progress while you fly. It will provide context and purpose for the aerial combat. Besides, I really like shooting up trains. Yes, there will be all sorts of ground targets and they will all behave in a reasonable manner, including defending themselves when they're able to. The physics model can certainly handle surface units, but we'd rather not commit either way on this.