A Dense Lattice of Structural Steel Pulverized to Dust?

First & foremost, thanks to Dr. Judy wood for these photographs.
Her web site is HERE
My motto is keep it simple stupid. Consequently, I have juxtaposed photos of the WTC before and after.
Before pics., show a dense lattice of chunky structural steel. How could one jet plane with a tank full of jet fuel, which burns way under the required temperature for melting steel, bring down the WTC building? It is IMPLAUSIBLE.These before photos, show a dense network of steel skeleton prior to completion of construction. Jet fuel could never destroy this entire steel network.
The after pictures display pulverized powder and very little structural steel. Where did all that structural steel go in these after pictures?