I'd actually sit the 2nd seat for a Hind or a few other aircraft. One, it would be a fantastic option for less experienced players to get a feel for a mission, learn the systems, etc. The cooperation would up the coolness factor, and might even make the game "less scary" for those that want into the serious simulations, as a stepping stone. Two, it would make for some excellent "trainer" style play. Finally, getting some hands on with some of the more complex weapon systems without having to fly, etc would be cool as heck.