just wanted to see what the forums thought of this conspiracy theory, btw, personally, it was a horrible incident first of all, second, most videos are believable but there are signs of early tampering to the towers beams, they found thermite on the ground zero, and just as the planes hit, a small flash could be seen at the nose of the plane on contact with the building, but they say the planes were hijacked, on the bottom of one of the planes, a weird looking device can be seen
This is a normal airliner

This is the airliner that went into one of the towers

as outlined with the red box, you can see some sort of device or something on the botton of the plane
these are the two compared

i could be wrong though, but here are the flashes seen just as the nose touched the tower

there could be some reasons for these but what most or speculating is that those or explosives of some type, soem say it may be the fuel, but the fuel tank is in the center of the airliner, the type of fuel system used is an a330, as shown below

also i apologize if anyone here is offended by this, i've gotten into conspiracy theories lately, they're fascinating to read up on