Aluminum airplanes are a lot stronger than iron cars. But you keep on forgetting that a heavy stream of water would also penetrate the building and buckle columns if the force was strong enough. Shall we calculate? A 767-200 weighs 142,900 kg (315,000 lb mass) and collides at a speed of 710 km/hr (~197 m/sec). The plane decelerates approximately in its own length, 48.5 meters. The effective deceleration is 400 m/sec2, or about 41 times the force of gravity. This means the total force to bring the 767-200 to a stop is about 13 million pounds. To give some perspective, this is about 1/8th the weight of the RMS Titanic It is absurd to think the columns could have resisted this force, and they were the only things slowing down the plane. Aside from the periphery and core columns, the rest of the structure was a total pushover.
An aluminum plane does not cleanly penetrate a metal wrapped building. An iron car goes into a wood house and you still got a car, lol.
Aluminum airplanes are a lot stronger than iron cars. But you keep on forgetting that a heavy stream of water would also penetrate the building and buckle columns if the force was strong enough. Shall we calculate? A 767-200 weighs 142,900 kg (315,000 lb mass) and collides at a speed of 710 km/hr (~197 m/sec). The plane decelerates approximately in its own length, 48.5 meters. The effective deceleration is 400 m/sec2, or about 41 times the force of gravity. This means the total force to bring the 767-200 to a stop is about 13 million pounds. To give some perspective, this is about 1/8th the weight of the RMS Titanic It is absurd to think the columns could have resisted this force, and they were the only things slowing down the plane. Aside from the periphery and core columns, the rest of the structure was a total pushover.
Ah, so it‘s math magic and not common sense. And thea can fly at 500mph a few yards off the ground (pentagon.)