Successfully beat the game to unlock cinemas, bonus planes, and levels.
Beat the game once to unlock the character viewer.
Enter the below code while the game is paused, you will hear a jingle to confirm the code was entered correctly. Unpause the game to see the effects.
Up, Up, Down, Down, Left, Right, Left, Right, L3, R3
While flying the Vic Viper pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle
To Unlock Ellen (Ken's Ex). Go through the game and focus on Albert with ken. and shoot him down every time he is on the map. and evenutly you will see a cutscene of him finding Ellens past. Later on after that. there will be another cutscene of her landing at the base with a note from Albert.
NOTE - Ellen is only playable during the last few missions(Preferably The Space Ones)
After Going beating the game. and saving continue from that file and start a mission and when you can select your aircraft hit the Square button to access a 2nd hanger which will Contain the Vic Viper and MX5000.