Extra Pilot and F-15:
At the title screen where it says "Press Start," punch in the following button combination: C-Left, C-Down, C-Right, C-Up, C-Left, C-Right, C-Down. You will now be able to fly a new F-15 plane, complete with a new pilot.

Extra Pilot #2:
Complete all 3 Bonus stages to get the new pilot, Spanky.

Level Select:
During the intro scene, punch in the following code: Up, C-Down, Left, C-Right, Down, C-Up, Right, C-Left, L, R, Z. You should hear a chime if the code worked. Now go to Main Game and choose your level.

Extra planes in Battle Mode:
Use the above codes to get the F-15 and the level select menu. Select the moon mission in the F-15, and destroy the big flying saucer with both superweapon lasers. You will enter your initals, and then go back to the main menu. Now select the two-player deathmatch. You should have 6 new planes. Note: you have to do this every time you turn on the machine to get the new bonus planes again. The game doesn't save the planes.

Thanks to Revolution readers J.J. Zoch, Scott McCutchen, Tim Allen, Hawkeye, John Manzo, Reid Gaskin, Roland M., and Erich!