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Dreamcast - Air Force Delta cheats

Unlock Special options in options menu and bonus airplanes:
Finish all 20 missions in normal mode. You can select unlimited missiles 
and you can disable HUD also in this option. You unlocked the following 
airplanes also:

AV-8B Harrier II 
F/A-18C Hornet 
F-15E 
MFI
MiG-1.44 
S-37 Berkut 
Sea Harrier 
Strike Eagle 
Su-27B Flanker 
Su-34 Platypus 

Double reward money
Do not use missiles to shoot down an airborne targets. Use only
guns. This will double the reward money. 

Full replay screen
During a replay hold X + Y to remove the text from the screen.

Unlock EE-Lightning:
Finish the game on Hard mode