Planes and helicopters
BASIC PLANE TYPES
Interceptor: Not one pound for air to ground. Great for air superiority, bad for everything else.
Fighter: Jack of all trades.
Tactical bomber. Close Air Support. Can kill ground units dead, but doesn't damage that many. Can even intercept, but is bad at it.
Strategic Bomber: Bombardment workhorse. Doesnt bomb units, but rather the area they are in.
Note 1: Naval planes generally have shorter range (by ~20%) and strength (by ~10%) than normal ones, some are slightly better at bombing (since strategic bombers cannot use carriers)
Note 2: It will be probably be necessary to alter the various prerequisite technologies for the planes as well.
Note 3: Stats for many units were nonsensical and have to be completely redone.
Note 4 : I dont have much personal experience with A2A combat in Civ4 (I always seem to overrun AI in late Industrial era), unit stats are based on mechanics described here
http://www.civfanatics.com/book/export/html/28
Note 5: Im not sure if chance to intercept plane can be over 100% (as even damaged supermodern planes should be able to intercept WW2 era planes easily). If that is not so, simple lower the >100% chance to 100%.
Note 6: What difference is there between Early fighter Units, Jet Fighter Units, Supersonic Units and Stealth Units??? Only available promotions (especially when Jet, Supersonic and Stealth fighters all share theirs), or something else too?