Why not have one map? With 300+ players in the arena (and growing), why not use a map of the world? The maps we are using are too darn small.
Perhaps we could start off small (eg) and limit the conflict to 1) subsets of Europe and Great Britain and 2) subsets of the Pacific war. Later, as the arena grows, incude more of Europe and Africa, SE Asia, China, Japan and etc.
The three sides would be randomly assigned to 1) Japanese & Russia <heh, great pair>, 2) Germany and Italian and 3) US and UK.
At the beginning of the war, if your side, say Rook, were assigned to Japanese and Russian planes, then you couldn't fly anything else! If you want to fly LW, then you must capture LW bases! Furthermore, LW planes can be flown out of LW bases alone! Similarly for US & UK and Japanese & Rusian.
In this manner, the entire plane set would be open to you ... you would have to go capture some bases though before you could fly them.
When the arena is reset, the plane sets would be redistributed among the three countries (rook/bish/knit.)
Sounds cool to me.

AKcurly