Use the following cheat codes to unlock the corresponding effects!
To unlock all planes, go to the main menu and type "snap" there. Then you will be informed that you are a cheater. Enter this code every time you start the game.
To unlock all Japanese Planes, at the main menu, type "japs". And again, if done correctly, you will learn that you are a cheater. ;) Use this cheat every time you start the game.