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.