The NIST report:

1. Analyze plane collision and approximate internal damage
2. Apply analysis to the entire building, even what was explicitly excluded
3. Fire analysis estimates the fire burned any given area up to 15 minutes before fuel exhausted heating structure over it to XX° because of 2)
4. Apply the max heating value to the entire building, even what was explicitly excluded
5. Correctly note the weakening of steel at that temperature, declare that the damage from 1) to 4) caused collapse initiation and once initiated could only be total collapse.

This worked so well because analysis of the building damage made sense for the images seen, the fire analysis was correctly analyzed for available data, and the weakening was pre-programmed that day. It's only when looking at the report holistically that the unstated assumptions become obvious.

It is the single best debunking material because it is what people will appeal to when calling 'truthers' crazy.