1.   He said the tail structure was broken into multiple pieces between three feet and six feet.

2.   The tail structure, called a sacral ganglion, shows up in petrified Stegosaurus skeletons as very large spinal cord openings in the sacral vertebrae, over the hips.

3.   Turbulence, pilot reaction and tail structure are being examined as contributing factors.

4.   Turbulence, tail structure and pilot reaction are being examined as contributing factors.