Google Earth has a Flight Simulator

The latest version of Google Earth contains a hidden feature: a full-fledged flight simulator. Press Command+Option+A in OS X or Ctrl+Alt+A on a PC or Linux box and you’ll be greeted with a hidden dialogue box that lets you choose an aircraft (F16 or SR22) and an airport. Once you’ve made you selection, you’ll be placed inside the aircraft. You can then fly around the globe in a free flight simulator, viewing the scenery that is pulled from Google Earth’s map files