New Mode:

By completing all 18 missions (finish the game)save and load. Now you new mode like

Eject from plane:

Hold L1 R1 L2 R2 all at the same time, there for letting you escape before you are shot down.

SP. CONTINUE:

Start over from mission one with all Aircraft, Weaponry and $$$ obtained previously.

FREE MISSION MODE:

Play any mission from the game.

TRIAL MISSION MODE:

A new mode which let you play Score Attack or Time Attack mode.

Also, beat the game once and go to option screen, you'll now have new goodies like Scene Viewer> let you watch any scene from the game. Music Player> listen to all 36 tracks.

Unlock X-02 MULTIROLE:

Get S-RANKING on all 18 mission on normal mode.

New aircraft paint:

On normal level and above, shoot down aircraft with that aircraft's pilot's name on it. On radar it will show up as red symbol and it is harder to shoot down. Should appear away from the main combat zone.

Expert mode:

To get expert mode complete all missions on Very Easy, Easy, Normal and Hard.

Ace mission mode:

To unlock ace mission mode, beat expert mode. It's very hard, as one hit from a missile will kill you.

Cheat from cheatBook

---

Bonus Options
-------------
Complete all 18 missions then save the game. Load the
saved game to unlock Special Continue,
Free Mission, Trial Mission, Scene Viewer & Music Player.

Unlock Expert Mode
------------------
Beat the game in Hard Mode.

Unlock Ace mode
---------------
Beat the game in Expert Mode.

Unlock the x-o2 stealth
-----------------------
To unlock the x-o2 stealth, get a rank of "s" on all 18
missions under the normal mode. In order to get the second
x-02, finish the game getting an "s" rank under the hard
difficulty setting. This will unlock a black plane.
Finish the game under the expert mode and this will unlock
the last x-02, this one is silver but once again you are
required to recieve an "s" on all missions.

Unlock the tiger striped F-4E
-----------------------------
You can also get the tiger striped F-4E by completing the
game once under any difficult setting, then using the sp.
Continue option.

Easy Yellow Destroying
----------------------
Once you obtain the QAAMs for any ship, use them on the
yellows. They will continue tracking them down until they hit.