Instructions
Load the game up and go into the menu screen. You will see "New Game," "Campaign," "Bonus Features," and "Options." The "New Game" option is where you input cheat codes.
Enter the "New Game" option.
Enter the following code on your controller:
Press "Right," "Down," "Left," "Left," "Down," "Up" and "Up" in succession.
This unlocks the F-22 Raptor for Starscream.