Jane's F-15

Invulnerability and Unlimited Ammo:
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Go to the Main Menu and enter the options screen. After that,
go to gameplay and select settings. Now look at the bottom of
the screen, it will say: 
"Cheats= Invulnerability and Unlimited Ammo" with boxes to 
check if you want them on. 


Fly any plane: 
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I'm not sure whether these are cheats or just some programing
errors, but I consider them cheats. This is one of the 
discoveries I found in Janes F-15:

When you are in the mission builder YOU can fly any plane in
the list. 

Make a new mission, edit a campiagn mission, etc. Choose 
the human plane (your plane) and choose a plane other than 
F-15 (eg. SU-27, Mig-29, etc.)
when you fly the mission campaign or whatever, the cockpit 
will look like the F-15's, but press F8 (exterior view) and 
see the difference!!!

Note: My F-15 is version is 1.02F and I don't know whether 
it applies to newer versions.