The best air to air WW2 combat for the pacific theatre is right here...

User Rating: 8.5 | Pacific Fighters PC
The best thing about the IL2 engine is the airtoair combat, its the most realistic you can buy. And Pacific Fighters does a good job of the pacific theatre. Ever wanted to take on 50 zeroes at pearl harbor? or even bomb the crap out of pearl harbor? now you can. This game also includes lots of campaignes... even an ausrelian airforce campaign.

pros:
exceptional air-to-air.
realistic physics.
over 100 campaigns with atleast 50 hours of gameplay for a sim fan. if not 200 hours or more.
the graphics are superb for a 2004 game.

cons:
some little things not worth mentioning.
you cant fly the B-29 or any other large bomber.
no B-29 campaign.

its a great game, buy it if you like WW2 sims.