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That was still a really big deal. The terrorists expected the towers to collapse immediately on impact. Everyone who was in the towers that morning and didn't die was saved by the "airplane-proof" construction.

> The terrorists expected the towers to collapse immediately on impact.

Where do we know this from? We can't ask them about that.

I don't know if it was mentioned in the documents that were found. But either way, the "airplane-proof" design did save thousands of lives, even if it failed to save thousands more.

The WTC towers were constructed to withstand a 1970s jet (707, DC-8, etc) that was on approach to JFK/LGA, hence at low speed and not full of fuel. This was not the scenario on 9/11.

i'd bet on it for fission plant containment buildings