I think these phone company records provide evidence of how cell phone calls were made from 9/11 planes.

http://www.911myths.com/index.php/Barbara_Olson_calls

These are calls that went through the "Claircom box" on AA77, the plane that hit the Pentagon. This is the box that handles seatback phones, but <b>calls did not originate from seatback handsets</b>. It appears they came from something plugged into external port #4 of the Claircom box.
...