Thunderstrike Operation Phoenix Cheats

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Level select:
By going to the options screen. Change VIBRATION to 1 and SOUND EFFECTS and MUSIC to 0. Then, press and hold L1 + L2 + R1 + R2 + Circle + Square. You will see the words SPOOKY CAT if you have entered the code correctly.
 

Ending bonuses:
Finish the game under the hard difficulty. The maniac difficulty and a bonus helicopter and will now be unlocked. The bonus helicopter flies, turns, climbs, descends, and shoots faster.

After finishing the game under the maniac difficulty you will unlock a third bonus helicopter, which you can use on any difficulty. It has the same top speed and fire rate as the second bonus helicopter, but more armor.