Exactly. You would need a much hotter setup, closer to smithing temperatures. Say, doesn't jet fuel burn that hot?
You're still missing an important variable here. There was not an unlimited amount of jet fuel and pure oxygen in the fire. Though jet fuel may burn hotter than wood, paper and other office materials, it would have run out quicker and it was spread among a larger area than a smith's furnace, which has refractory materials in it to keep the heat concentrated by the way. The towers were not built like smithing furnaces and the fuel was limited. It was a much bigger space and the heat just wasn't enough over that volume of space.
Thank you, that's where I was headed.
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