The new 4.2 release of Google Earth has an Easter Egg flight simulator that you can unlock by pressing ctrl+alt+a. One comment thread on Slashdot is about tinkering with GEarth files to change gravity and other settings. If I were working on an airline account, I'd set up a demo flight. Mesmerizing. Games based on Google Earth can't be too far behind. More details and a video on Google Earth Blog.