RSSI hesitate to keep beating this dead horse thread but…
Nova had a great episode re 9/11: Why the Towers Fell
http://www.pbs.org/wgbh/nova/transcripts/2907_wtc.html
Leslie Robertson was an engineer that designed the World Trade Center.
LESLIE ROBERTSON: We had designed the project for the impact of the largest airplane of its time, the Boeing 707, that is, to take this jet airplane, run it into the building, destroy a lot of structure and still have it stand up.
LESLIE ROBERTSON: With the 707, to the best of my knowledge, the fuel load was not considered in the design. Indeed, I don’t know how it could have been considered.
END QUOTES
Now I’m not an engineer but if you design a building to handle load x, it stands to reason that it might not handle load x + 10.
there should have been at Shanksville
There wasn’t really much of anything large enough to piece back together.
When United Airlines Flight 585 crashed in Colorado Springs, it hit the ground so hard there was literally nothing but fragments left.