Not on the planes Sam. It was demolition. Even a big bomb on the plane wouldn't cause the collapse of the towers. In order to bring down a building in freefall speed, you would need explosive devices to bring down the core of the structure in the WTC buildings to make it so. There has been a substantial amount of reports of what seems like high explosives going off at the base of the buildings inside. The planes that hit the buildings can't create this. There is no way possible that the WTC towers were 'burned' to the ground. That is impossible.