As fascinating as Google Sky is, there is a hidden feature of which we cannot find any information about even in product release notes.
To access the hidden feature, open latest version of Google Earth and hit Command+Alt+A.
The Google Earth Flight Simulator comes with two aircraft options, a F16 Viper and the more manageable SR22 4 seater. Players have the option of commencing the game from their current location in Google Earth or can pick from a list of pre-determined runways. Control instructions can be found here.
Here's the initial view from London Heathrow Airport:
This hidden feature could become a standard feature in the next versions of Google Earth and it will bring even more fun to the application.