It would be quite cool if one had the ability to fly around the map in your own spaceship. BF4 is a mega multiplayer game with players flying their own planes strafing those on the ground. It would grand to fly into battle rather than drop into the game.
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While I think adding the ability to fly your ship around the map wouldn't be a good idea, I'd like to see space battles and segments where you can pilot your ship for sure. As far as I know this won't be in the game, but it'd be nice to see a DLC or a patch adding it in the future.