The missions are sort of just mixed in together, I suppose. You still just choose them in Pilot Careers - Country - then from a drop down list you choose your campaign. There's not a whole lot to tell you what campaign came from what game, but the 1946 ones are The Rebel and Burning Streak in...
I have a 1:72 Italeri P-47 N Thunderbolt (No. 1240, 2004 if that helps) that I have opened but nothing else to this point. If I don't get an offer relatively quickly I'll start working on it (I'll edit this post if that happens). Barring that, I'd love to trade for any WWII aircraft (though...