For what it's worth, I would like to stick with aircraft that made a reasonable impact to the course of the war, just as AH is doing now. My main reason for this is Scenarios. It's my favorite part of WWII on-line flight sims. Even when it's just my Squadron running a Squad-nite mission, we try to recreate historical missions.
I like the way AH is building the current plane set up. A core set of classics with a sprinkling of less-well known (and simulated) but still historically significant types like the Macchi and George.
I for one am looking forward to some early war stuff, but it may make more sense to start with the current set of late-war craft and work sequentially backwards in time.
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Rojo (S-2, The Buccaneers)