There are a number of historically significant aircraft that are typically excluded from sims:
Ju-52 (over 5,000 built, 3-engine transport, Germany)
Bristol Beaufighter (over 10,000 built, Great Britain)
Curtiss SB2C Helldiver (over 7,000 built, USA)
Petlyakov Pe-2 (over 11,000 built, USSR)
Of these, the Bristol Beaufighter should probably be next in line for addition into the Aces High plane set; followed by the Ju-52 and the He-111. This would open the doors to many cool ETO scenarios.
Casper