Я И САМ ТАК ПОДУМАЛ -
про ЮЭ-175, который - эдак вот в южную башню:
http://physics911.net/gallery/
"The incoming aircraft" - "".... a charge of thermite planted at the planned impact site was ignited a few seconds before impact, reaching an incandescent temperature just before impact. The purpose of such a charge (along with other charges inside the building) would be to “soften” the target...""

The incoming aircraft
про ЮЭ-175, который - эдак вот в южную башню:
http://physics911.net/gallery/
"The incoming aircraft" - "".... a charge of thermite planted at the planned impact site was ignited a few seconds before impact, reaching an incandescent temperature just before impact. The purpose of such a charge (along with other charges inside the building) would be to “soften” the target...""

The incoming aircraft