Automatic Allies
When 1 country is outnumbered by a determined percentage it is automaticalled allied with the next weakest.
Viola!
The alliance balances the arena and makes for some serious strategy. When the balance changes, the countries split up again.
We all want to fly our country, to change countries and to see the game evolve more sratedgy, missions and fun.
BTW could this work for historical countires? A Germany, Italy, England, America, Japan in the same arena. The arena allies them based on numbers and historical precedents. Still 2 or 3 sides, you can fly any country you want and still not be badly outnumbered.