Awesome idea, i could just imagine flying in squadrons of jets, like in real life.
But WHY aa? if it's a flying map, don't ruin a good dogfight by some idiot just waiting for you to stop turning for a second - It would make the map much less fun.
Then again, there are just too many horrible pilots around, I've been playing for 5 weeks and already there are few players who can lay a finger on me in pubs - I don't mean to brag, as when an experienced pilot comes along, i don't stand a chance, but the masses don't seem to be able to fly at all.
And of course, as kamikaze pointed out, there would just be TKs every other second. I never chase an enemy jet with a teammate at the same time, as it almost always results in a TK by missle - I don't think things would be much different on a map like this.
..I'd still like it though.. :p Would be great if you could play it with decent pilots working together properly