"At least we do agree that thermite could have destroyed those steel beams. That's a start. And you do agree, I take it, that an aviation fuel fire cannot burn hot enough to cause a steel frame building's structural supports to bend and collapse? "

Point of fact: the aluminum in the plane did melt because of the jet fuel fire.

Point of fact: the melting point of aluminum is about 1200 degrees

Point of fact: the temperature that is required to reduce the structural strength of steel beams by at least 50% is about 1000 degrees.

Ergo, a jet fuel fire CAN burn hot enough to cause a steel frame building's structural supports to bend and collapse.