At the plane select screen, press the R-button.
Mao Mao and his F-15
When it says, "Press Start," type in this combination: C-Left, C-Down, C-Right, C-Up, C-Left, C-Right, C-Down. Mao Mao and his F-15 will now be available. You can also get him by continuing a game three times at the Tokyo stage.
Spanky the Dolphin and his X-29A
Complete all of bonus stages and Spanky the Dolphin and his X-29A will now be available.
