OK, it's not really a competitor, but Google Earth's rudimentary new flight simulator is actually pretty fun to mess around ...

Google Earth's Secret Flight Simulator Is Now Free for Everyone on the Web ...

The good news is that as of this week, you can at least while away the hours by taking to the virtual skies of Google Earth’s ...

Google has brought its long-hidden desktop flight simulator feature to the web version of Google Earth, letting anyone fly over real-world terrain directly from a browser with no download required.