Locate the 'Apple Maps' on your iOS 6 device and open it
It will show you the present location. Click on the 'search' box
Type the name of the city you'd like to explore. Please note Flyover feature is not available for all the cities. I searched for New York City
Click on the search button after entering the name of the city
It will take you to a page like this
Now click on the bottom right corner
The default view will be 'Standard'
Click the Satellite button to change the view to 'Satellite'
After you have chosen the 'Satellite' view click on the map
This is how Satellite view would look like
Please note the '3D' button it will change to little building button where Flyover is available. Zoom to make that happen
Once you see the little building button click on it
It will turn blue and now you are flying over. Just zoom to enjoy.
Flyover looks beautiful, doesn't it?
Now as Apple Maps is 'Vectored' you can use two fingers to pan, zoom & rotate
You can view any building from all angles
Zoom more to view swimming pools & you can almost see inside the windows
Note the 'compass' on the top right will appear anytime you don't have North up
Click on it and North will be where it's supposed to be
Click again on the little building button again to go back to Satellite view
Go back to 'Standard' view when you're done! ENJOY!