Cause they are all in the air...
Actually, there is a far better Birdseye view of our field on Microsoft's Live Maps website, you can even see a plane on the
runway...
The photography is out of date though since the pilot stations are using the old orange fence material so that puts it at least 2 years old. And if you switch to aerial view, you will see a slightly different scene, different day, different plane on the runway.