Since the lot of you denying the fact that the steel beams melted seem to know anything about chemistry, and chemical reactions whatsoever, I'll enlighten you.
Magnesium was a metal commonly used in the body of aircraft. When magnesium starts to burn, it can burn at a temperature of up to 3,500 degrees farenheight. That's pretty hot. In addition, when aluminium, also used in the body of aircraft, is converted to a powder-like form, it can burn at up to 1,400 degrees farenheight. Now, the burning temperature of jet fuel can range from 800 to 1,500 degrees farenheight. Combine all these temperatures and you get this:
3,500 + 1,400 + 800 to 1,500 = 4900 to 6400
Now, let's compare to the melting point of steel, which clocks in at just about 2750 degrees farenheight. When you look at it, the lowest burning temperature of an airplane that would've just crashed into a building is almost twice the melting point of steel.
In short, burning jet fuel by itself can't melt steel beams, but when you combine it with the fact that the rest of the plane is burning, then it's way more than enough to melt steel beams.
You're desperately scraping the last remnants from your barrel in order to keep feeding those that do not want anymore.
Let's make it easier for you and then you can argue.
Let's assume that the so called plane hit the building and took out 5 whole floors, completely and allowed the upper floors to fall down to the intact building after those 5 floors were took out.
Now then, you still have one huge building of at least 80 floors, intact and stronger and stronger as it goes down and also bearing in mind that it also had extra supports in 2 sections.
But you still also have the super thick and super strong 47 steel columns to crush straight down to the floor, snapping just about all the welds and bolts, leaving a nice pile at the bottom in near free fall speed.
OR, how long would you fellas like to say how long the building took to actually fall to the ground?
You see, in reality in a pancake collapse from the top to the bottom, you could say it would take 1 second for each floor to pancake into the next, bearing in mind that each floor is going to act as a friction damper due to the air in each floor that will be compressed and pushed to the outer sides.
That alone would mean the buildings would take around 100 seconds to fall in that pancake.
Let's say half a second each floor. Pretty fast, right?
That still makes it 50 seconds.
Even a quarter of a second for each falling floor would still mean 25 seconds for entire collapse.
So tell me, how long (by TV footage) how long they took to collapse to the ground?