Steven,
Spitfire MkIX is a 1942 aircraft, N1K2-J is a late 1944 aircraft.
HTC's idea on how to get early war aircraft seems to be to make the perk points gained by flying less capable aircraft greater than the number of perk points gained by flying more capable aircraft.
IMO to get this to work there has to be a more desirable list of perk planes. The Me262, Spitfire MkXIV, P-47M and B-29 would help greatly in this.
Sisu
-Karnak
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We few, we happy few, we band of brothers;
For he to-day that sheds his blood with me
Shall be my brother
Bring the Mosquito FB.MkVI Series 2 to Aces High!!!
Sisu
-Karnak