"Combat Aces" came out in 2001. 70 missions including night-time, 26 planes-yes, you can fly dirigibles too, new scenery including a choice of summer or winter landscapes. There was a patch issued too, to fix a collision bug.
I don't know if the add-on is still available, although I have it. One of the great things about it is you can match up WW2 Zeros and Corsairs against WWI Fokkers and other planes. Cross-era battles, if you want. I've done it many times. You'd be surprised at the outcome!
Go here, if you don't believe me. It's a review:
http://www.netwings.org/pages/default.a ... taces1.htm
I don't know if the game is still available anywhere.
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