More Low Flights
Here one can plainly see the Altocumulus clouds and right below them are chemtrails. This means that the the trails are under 20,000 feet!
Mid-Level Clouds
The bases of mid-level clouds typically appear between 6,500 to 20,000 feet (2,000 to 6,000 meters). Because of their lower altitudes, they are composed primarily of water droplets, however, they can also be composed of ice crystals when temperatures are cold enough.
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/home.rxml
Sometimes there are several layers of Altocumulus. When this photograph was taken the sun had set on the lower layer, which was about 10,000 ft, but was still shining on the upper layer at 16,000 ft. A number of species of Altocumulus can be commonly seen.
