Thank you for the support and voice of reason, Laurie.
Break up a 700 player community into 4 fragments= bad. Period. Anybody that argues this, well...I guess you don't fully understand the dynamics of online communities, or the value they add to the company's bottom line.
Align the planes to the time-period in which they served = GREAT. I love it. No more SpitXIV beating up (unrealistically and unhistorically) on the P40b driver.
How to combine the 2 needs? Uh, don't break the players apart and onto different worlds, HTC. Just rotate the war periods on the big 700 player server. Heck, make a great big re-enactment of all phases of WWII out of it for extra fun! Everyone is together still, fighting the big fights, but finally on the level playing field they want.