Letter from 9/11 Plane

This is fascinating and goes with the 9/11 museum post below.  One of the items in the 9/11 museum is a letter that literally fell from one of the planes that crashed into the World Trade Towers.  It fell through the fire to the ground in Manhattan and was picked up by a businessman and sent to its addressee.  Above is the story and a great way to teach about primary documents.