In Real Plane Crashes

wings break off, the plane changes course upon contact and explosions happen immediately -- unlike the hit on the south tower, where the plane glides completely through huge steel beams without one part of the plane breaking off.

Now, I have no feasible idea for how they could have faked the second tower hit-- and in particular, how they could have created a plane-shaped scar in the building in the absence of a plane.

I think some sort of flying machine hit the south tower. But that was no ordinary passenger plane, that is for sure.