 FACT: When theyre exiting the home where the jumbo jet crashed, the  cockpit window is broken with a hole in it. Cockpit windows do not  break like windows in homes. They are in fact multiple layers of  various materials including special glass, heating elements, bonding  materials, etc, and when they break, they "spiderweb" into many,  many small pieces. The window in this scene appeared to be a single  pane of glass that looked like it had a rock thrown through it.