More Fighter:
To unlock the following fighters you have to win all 20 missions:

       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
       

EE Lightning:
Beat the game on hard to earn one more plane in the shopping screen,
the EE Lighting.


Quick Money:
Shoot down any required aerial target with guns and not missles and
the bounty you get for it doubles.


Remove Replay Text:
In order to get rid of the replay text during the replays all you need
to do is hold down the X and Y buttons. Release the X or Y button and
the text will come back up.


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.

Patrick Hofmann <ph@dlh.net>