[eno_]

There was nothing found at a distance from the crash site that is not perfectly consistent with 1)partial breakdown of structural integrity caused by extreme maneuvers (that's techie for "the plane was and a few bits sheared off) and 2)normal dispersal from the crash.

Except for the pieces of human remains. Unless the plane was "gyrating out of control" while a moose bit someone's sister while standing on the wing.

[Ichneumon]

Except for the pieces of human remains.

I can assure you that if a plane is tumbling out of control violently enough to rip pieces of the plane off, pieces of passenger can go with them as well.

Furthermore, a 700+ mph crash can fling pieces of debris (and body parts) amazing distances. As a car or plane breaks up in high-speed crashes, various parts begin to spin with enormous force and can "catapult" parts of themselves or other pieces of debris off in practically any direction, like a baseball batter hitting a fastball.

Finally, another poster has pointed out that one of the hijackers may have set off an explosive belt during the descent, which would have left body parts (his, or someone else's) scattered through the air.

None of these three scenarios require a shootdown by a missile.