you could perhaps have a Free for All GV battle just for fun, no scoring or anything.
THIS is one of the BEST event ideas EVAR! So, you got shot down? Roll `em!
I like this idea.
We could have it work this way. Once a player is out of airplane lives, he can up a GV, and there will be no limits to GV lives. The GV's will fight a battle between themselves, and the winner of the GV battle each frame will be the side with the most kills. We'll preclude interaction between planes and GV's (as that was never popular in past scenarios).
The map doesn't have a lot of options for battling over bases.
Here are the spawns on the map:
Here is the full map with bases: