✔ 最佳答案
They didn't.
There is just too much evidence now that suggests an inside job: the fact that all THE WRECKAGE WAS SHIPPED ABROAD as soon as possible, the fact that even ROLLS ROYCE themselves have said that the engine recovered were not the type of engine used on the type of plane (b757) that was said to be responsible. The fact that most of the 'hijackers' are still alive:
http://whatreallyhappened.com/WRHARTICLES/hijackers.html the fact that no jets were scrambled in time; that no significant plane debris was found at the pentagon site (planes do not vaporize!); that the buildings seem to be demolished, especially building 7; that jet fuel cannot melt steel, even though molten steel was seen "flowing like lava"; that the first responders heard explosions in the basement and within the buildings before they collapsed etc...
-WTC leaseholder Larry Silverstein admitted that building 7 was pulled down by a controlled demolition:
http://www.youtube.com/watch?v=-jPzAakHPpk (He changed his story the next day)
-Official version claims the towers collapsed due to 'pancake effect', meaning the floors came detached from steel girders and fell on top of each other, collapsing the tower. If that's the case, why weren't any of the (core column) steel girders left standing?
http://4.bp.blogspot.com/-ub_6RM9p6nY/TjWusVortWI/AAAAAAAAAXk/uSMFJEypbn8/s1600/x-wtccore.jpg
-Pictures show smoke coming from the basement seconds before the plane hits. People (including firefighters and employees) also heard explosions from below the towers, moments before the plane hit. PEOPLE WERE KILLED AND SOME SERIOUSLY INJURED IN THE BASEMENT.
-Pictures show steel girders with diagonal cuts in the them. This is exactly how controlled demolitions bring down buildings:
http://www.thetruthseeker.co.uk/wordpress/wp-content/uploads/tts/wtc_ruins_diagonal_cut.jpg
-Designers of the WTC say they were built to withstand MULTIPLE impacts from such an aircraft.
-Official version states the plane that hit the pentagon 'vaporised' which is why very little traces can be found. Yet they said they managed to find DNA to identify all of the victims on board. Furthermore the building didn't 'vaporise' in any way. What type of plane vaporises, leaving the building and human DNA relatively undamaged.
-The passport of one of the hijackers in the aircraft was supposedly found in the rubble at the WTC. It's clearly impossible for any personal effects to survive the impact and explosion, therefore it must have been planted.
-All CCTV footage from around the pentagon has been hidden and never released. Why do that if there is nothing to hide? 86 CCTV cameras show no airplane???
"WITH ALL THE EVIDENCE READILY AVAILABLE AT THE PENTAGON CRASH SITE, ANY UNBIASED RATIONAL INVESTIGATOR COULD ONLY CONCLUDE THAT A BOEING 757 DID NOT FLY INTO THE PENTAGON"...Colonel George Nelson Aircraft accident investigator U.S. Air Force