i dont care how fast the planes were traveling, nor how long the buildings were able to sustain before their eventual collapse. those buildings couldve burned for 4 hours each before they fell and it wouldnt make a difference. the fact that the top sections had fallen in a seperate direction makes sense, considering the damage the planes had inflicted...kinda like how a tree falls to the side it was primarily cut on. anyways the bottom line is this: there were a solid 90 or so floors under each of the crash sites. you cant tell me that they would just collapse all at once due to this damage caused near the tops of each building.
So you don't care about how long the buildings were able to sustain before the collapse, but in your very next sentence you say the buildings should have been able to sustain for at least 4 hours. I thought you didn't care about how long they could sustain?
Whether or not you care about how fast the planes are traveling you can't deny that two large commercial airliners have never hit skyscraper before. Ever. Everyone trying to say "the first time a steel building collapsed from fire...etc." just leaves that plane impacts out of it.
The top portion leaning makes a lot of sense. I've never seen a controlled demo building just lean over for 5 seconds before falling.
They didn't collapse all at once. Even in the controlled demolition theory they show the videos asserting that charges are going off successively down the tower. A building that was brought down by controlled demolition shows movement in the whole structure.
The top portions were stable after the impacts because the tower was over engineered and could support the static load. Static loads are things like walls/columns. It could also support the dynamic loads (people, furniture). But when the tower started to lean it went from a static load to a dynamic load which is a big problem. All structures act a lot different under a dynamic load. They can't take as much dynamic load and static. When the tower starts to move the entire thing becomes 100% dynamic which is a bad bad thing.
Also most controlled demolitions I've watched show the charges going off from bottom to top as well. The controlled demolition folk say the charges are going off from top to bottom according the the video evidence.
Then you add in the video evidence in my previous posts showing large parts of the towers that remained standing during the collapse. Seems like if the demo crews were so brilliant to sneak in explosives on April 2001 then they would have been brilliant enough to make sure all parts of the towers were rigged with explosive so they wouldn't have large parts of it remain standing.