Still looking to download youtube stuff for use in your classroom?  All you have to do is just change <strong><em><span style="color: #ff0000">youtube</span> </em></strong>to <em><strong><span style="color: #339966">kickyoutube</span> </strong></em>in the url of the video and it will take you to kickyoutube.com where you can view  all the options for downloading the video.

Give it a try.  Check this one out. It shows air traffic around the world for 24 hours.