Well to be realistic I dont see any reason why there cant be hundreds of planes...
With DX11 tessalation it would not be nearly as hard on the GPU. With modern multicore cpus they should easily be able to handle large fights with hundreds of planes, I dont see any reason why they couldnt since the AI load hasnt increased a huge amount (like say Civ4-Civ5 or STW-RTW). Hopefully we will see hundreds of planes in the future if the engine is as scaleable as Oleg claims.
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