[Spirit of Liberty]

Yes, but wouldn’t those planes have been going at a slower speed than the ones that hit the Twin Towers? Just think of the difference in the damage to a brick wall that’s hit by something going 20 mph vs the same object going 80 mph.

[Extremely Extreme Extremist]

I don't know. All I know is that plane noses are easily indented after striking birds. All I'm saying it's time to ask the hard questions, and if that means subpoenaing the Truthers or architects or structural engineers or whatever, then go for it. Because now, I find it difficult to believe that planes alone caused two powerful buildings to first explode and then neatly crumble to the ground and barely affect the other buildings around it.

And you have to remember that WTC 7 collapsed, and nothing crashed into it.

[MortMan]

An automobile is a much more solid object than an airplane.

I cannot account for all of the physics, but airplanes dent when struck by birds because their skin is thin aluminum (or composite, now). The burning jet fuel, IIRC, is hot enough to melt unguarded steel. The trade center did not wrap the structural steel in asbestos, like buildings before it, due to the asbestos concerns.

If you throw a grapefruit at a glass and steel wall at 100mph, it will do much less damage than a baseball thrown at the same speed.