There was a US military plane a few hours after, but it didn't have Osama bin Laden. It had other bin Ladens though. Bush was getting them out of the country, even though the FAA had declared planes couldn't fly, to protect their safety. He got the bin Laden family the hell out of here, and the FBI couldn't even check them. Actually, even though all planes were grounded, it went around the country, picked up a bunch of people, and then left. The FBI couldn't hold them for questioning, because they weren't in the country anymore.
Booms in the subway- sonic booms? I doubt it... If you think about it, subways resonate sound extremely well. A collapsing building is likely to make some unusual noises. Support beams snapping could make the type of noise that in a subway could be interpreted as an explosion.
The gas doesn't explode... Read up on your own physics. Gas doesn't burn. Not at ALL. Pour gas on the ground, and drop a match in. It won't light. Wait a few minutes, until it's gotten smaller, and THEN drop a match in. Then you'll get flames. Gasoline WILL NOT BURN. Gasoline vapors burn. The only reason gas explodes in the movies is... it doesn't, they have explosives set up.
If liquid gas doesn't burn, it could very well weaken the support beams. Plus, airplane fuel is a much stronger version of gas, so it's probably going to corrode the supports pretty well. And there's a lot of it, since the flights were all from the east coast going to California, nonstop. That's a lot of fuel. Obviously, some burned, and the fumes that were given off burnt when they evaporated, but most of the flames were from the materials in the building.
The building collapsed downward because the supports were weakened on all sides. The flames didn't melt them enough, though you're right. Heat isn't transferred equally, but it radiates from a source, so it's unlikely that it fell that way because of the flames. If the flames are hot enough, it won't actually take as long as usual to melt something. Try boiling water at very low heat, then go build a bonfire and boil it. Big difference.
No, something else weakened the supports. I'm inclined to believe that the gasoline did that, and maybe it reacted with the air, or asbestos, or something, but it ended up eating away the supports.
If the top part of it falls on something... Even just the top part was heavy. If it collapsed on the bottom parts, the lower supports could just have catastrophic failure.
It is a little illogical how it appeared, but things aren't always as they seem. For example, the JFK assassination. He was shot from the back and his head was thrown forward by the bullet, but then it snapped back. It can be proved with physics that there was only one shooter, yet some use that as a reason for there being two snipers there. It may have looked like the bottom fell first, but I think that the bottom supports failed. They could support the weight of the top, but not if it fell onto it, even for just a moment or two. As you said, the rate of acceleration of objects on earth is 9.81 meters per second. That would be a pretty big shock when the top collapsed, it could very well cause the bottom supports to give way.
Sorry, but I'm not buying into any of the theories. It was a terrorist attack, but less people died in it than most of our attacks on "them". We aren't attacking them, we're attacking their land. And the natives are getting pissed, and fighting back. We're creating our own enemies in this war. You wonder why people don't like us? Maybe it's because after one attack on us, with a few thousand killed, we decide to invade their country and kill quite a few more. I feel sorry for the people that got killed on 9/11, but we seriously overreacted on that one. We should have improved security after that, not become paranoid (U.S.A. P.A.T.R.I.O.T. Act (Yeah, it's an acronym. Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001)), and we shouldn't have gone on the offense. Using it as an excuse to start a war to get rid of someone is not a good way to earn respect among the world...
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