The flying isn't as good as Microsoft's but the scenery I think is better in some aspects. It's fun and free. Fly an F-16 or an SR-22.
1.
www.google.com/downloads
2. Click on and download Google Eearth
3. Once installed click on the map so that you've selected that frame.
4. With the capslock key on (has to be a capital A) hit "Ctrl+Alt+A" at the same time. A window will pop up asking you which aircraft you'd like to fly.
I recommend the SR22 as it's much slower and gives your connection more time to load the frames. You can select which airport you'd like then fly anywhere in the world google has maps for. Great detail especially in areas where have "laser measured" the cities so the exact buildings etc are there.