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Quote by: Orangutan  I'd have thought Americans, with their penchant for firearms, would be familiar with the effects of high speed?
A soft lead 6mm air-rifle pellet, presuming a reasonably powerful rifle, can easily penetrate through 3mm of mild steel. All it takes is velocity, say around 500mph, such as the speed of an airliner...
Can an aluminium bullet, caliber best defined as "Boeing Airliner" cut through steel beams? Erm, yes.
Would it then be utterly disintergrated and basicaly in shredded bits? You betcha.
Could it then carry on and slice through or significantly damage the much denser steel beam core? No, by that time it was aluminium confetti and wouldn't do a damn thing.
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Commercial airliners don't turn to confetti when crashing into a building. And even if they did, they wouldn't cut steel beams. It's either one or the other (confetti or cut beams), but not both. In reality however, neither would happen. A real airliner would crash against a building, not effortlessly glide through like in the FOX 5 video.