Enter your pilots name as "BUCKAROO" (another source also recommends "448944895554", "KYLIE", or "SO WHAT IF I DO". The message at the bottom of the screen tells you cheat mode is active. Now choose any mission you like and as an added bonus, your plane comes complete with a few extras. For a start, you can fly on the ground and you can hit the `D' key anytime during the flight to be taken to your next target!