DIA: North Korea Planned Attacks on US Nuclear Plants

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19. The World Trade Center was design to withstand a plane no bigger then a 707

The plane that did hit the World Trade Center were all much larger then a 707 and fully loaded with fuel. What was considered in the design was the towers being hit by a 707 running out of fuel and headed to an airport. A full Fuel load was NEVER brought into the calculations (and if it was, would have shown that the towers would have FAILED even with a 707 if that 707 was fully loaded with Fuel load:

The three-page white paper titled Salient points with regard to the structural design of The World Trade Center towers described an analysis of a Boeing 707 weighing 336,000 pounds (152 t) and carrying 23,000 US gallons (87 m3) of fuel impacting the 80th floor of the buildings at 600 miles per hour (970 km/h). It is unclear whether the effect of jet fuel and aircraft contents was a consideration in the original building design, but this study is in line with remarks made by John Skilling following the 1993 WTC bombing. Without original documentation for either study, NIST said any further comments would amount to speculation.—NIST 2005. pp. 305–307

http://en.wikipedia.org/wiki/Collapse_of_the_World_Trade_Center#cite_note-14

http://en.wikipedia.org/wiki/Boeing_767

Two 767s were involved in the September 11 attacks on the World Trade Center in 2001, resulting in the collapse of its two main towers. American Airlines Flight 11, a 767-200ER, crashed into the north tower, killing all 92 people on board, and United Airlines Flight 175, a 767-200, crashed into the south tower.

A Boeing 767 carried 16,700 Gallons of Fuel (South Tower) Collapsed At 9:59 am, the South Tower collapsed, 56 minutes after being struck.

A Boeing 767-ER carried 24,140 Gallons of Fuel (North Tower) The North Tower collapsed at 10:28 am, after burning for 102 minutes.

Thus while a Boeing 707 was considered in the design, fuel load of a 707 was NOT. The planes that did hit the Towers had about the same fuel load as a fully loaded 707 and it appears that the FIRE from those planes is what did in the Towers NOT the planes themselves.

Bin Laden was an ENGINEER and thus knew what it would take to knock the trade center down. Now, bin Laden expected a more conventional collapse not the pancaking that happened, but he knew there was enough fuel in those planes to do the job. IT was the FUEL that caused the tower to pancake NOT the impact itself.

Thus the TOWERS were never designed to take a hit by a FULLY FUELED JET. An almost empty jet looking to Land as JFK Airport but not a fully loaded jet and it was the FUEL burning on three floors at once that cause the Towers to pancake.