So where do you think the NY FD got their info from? Seems misplaced given your knowledge.Having worked for AIG when the towers came down, who were the primary insurers of the WTC, I was privy to the the reports written regarding how and why the towers came down.
At the time I, along with all others with access to the information had to sign a confidentiality agreement which I believe last for 50 years (bit excessive, especially as the normal CA's we signed were for 'up to ten years' but there you go), and trust me, there were no explosives in those towers.
Mis-management, poor maintenance, even badly built. But no explosives. No covert activity to fuel a conspiracy theory. Nothing.
Basically those flying the planes 'got lucky'. Obviously those who died were far from lucky.