The Type 2 Fighter (aka Ki-44, but Japanese operating units almost never used the kitai number, to them it was Type 2 Fighter) saw very little action in 1942, just 9 pre-production models were used in combat trials by the 47th Independent Fighter Company in Burma. The AVG met them on a few occasions, but without any clear and notable results compared to those v. Type 1's. The first regular Type 2 unit to enter action was the 25th Regiment in China in July 1943. There's probably no reason to include the Type 2 as a 1942 PTO fighter if the P-38 is excluded. Actually P-38's flew missions in the Solomons and New Guinea late in 1942 besides in the Aleutians, but I don't disagree with excluding it as 'main' 1942 fighter. It also didn't have any great success in those early missions.I forgot about the Ki-44. Man, what a blunder. Does anyone know if you can add things to a poll?
Among other basically later planes with brief debuts in 1942, a preproduction Type 3 (Tony) engaged one of the Doolittle raiders over Tokyo and the B-25 claimed to have downed one or more Bf109-looking fighters, (though it was an overclaim). And Type 2 Two Seat Fighters (Nick) were also encountered in Burma and China, though they weren't successful in their early daylight heavy fighter role.
The Buffalo saw quite a lot of action in 1942. I don't suppose anyone would vote it best, but OTOH the Hurricane and Buffalo combat records PTO '42 weren't a lot different, both poor. The Type 97 (Nate) was also widely used up to mid '42 and more successful than either Buffalo or Hurricane, though pretty clearly not best.
Best, as usual, is it which looks subjectively best based on performace stats (we can't always be sure are even correct)? or is it best combat results, though that will also include pilot and other factors? but OTOH it's completely tangible, did well or didn't. If it's combat results there's no reasonable question: the Zero, clearly the most successful fighter in the Pacific overall in 1942.
After that it could debated between Type 1 (had generally similar success to the Zero, with exception of v. the AVG) or F4F (only Allied fighter to achieve ~1:1 kill ratio v the Zero, mainly second 1/2 of 1942, though it didn't match the smashing victories the Zero achieved in first 1/2 of '42). The P-40 and P-39, in the actual circumstances and actual USAAF units that flew them, were clearly less successful than the F4F was against the Zero in 1942, and the great majority of AVG fighter victims were Type 97's, they never met the JNAF.
Joe