Air force Delta Codes -

Bonus fighters
Successfully complete all twenty missions to unlock the following fighters: Sea Harrier, AV-8B Harrier II, F/A-18C Hornet, F-15E Strike Eagle, Su-27B Flanker, Su-34 Platypus, S-37 Berkut, MiG-1.44 MFI. Successfully complete the game under the hard difficulty setting to unlock the EE Lighting.

Special options
Successfully complete all twenty missions under the normal difficulty setting to unlock a "Special" selection on the options menu. The new options allow unlimited missiles and the HUD display to be removed.