I will have to agree that Japanese and Russian planes are what is need to balance out the aircraft set. While not all of these would be useful in the MA they are needed for the CT and Events.
TOP PRIORITY
JAPANESE: OSCAR, GRACE, BETTY, TOJO, JACK, JUDY, NICK
Big need for the late war carrier planes.
RUSSIAN: Lagg-3, MIG-3, I-16, Pe-2 (or3), IL-4, TU-2
Russian set needs attack planes and early war fighters.
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SECONDARY
AMERICAN: P-39D, B-25C, BUFFALO, HELLDIVER, DEVESTATOR
ITALIAN: Cant Z.1007, MC.200, RE.201, SM.79
FRANCE: D.520, MS.406
GERMNAY: HE-177, DO-217
POLAND: PZL P.24, PZL P.11, PZL P.37
UK: Wellington, Whirlwind, Barracuda
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ADDITIONS TO WHAT WE HAVE:
37mm cannons to Stuka to make JU-87G
Panzerblitz rockets for Fw-190F series
Multiple small bomb racks for 109's & 190's
800kg bomb for KATE
Bomber version of Mosquito
Early War version of P-38
Mannable 5" singles on the Destroyers
Mannable 88's at the fields with G2A & G2G ammo
Carrier hook for the Sea Hurricane
JU-52 Transport (with gun armament & version to use as a bomber)
We can really get along for awhile without another "Ubber Bird" version of the Spit, P-51D, P-47, Corsair & ME-109, & FW-190 and definately the B-29.