Does seem a very small hole for an airliner to make, even if the wings were sheered off, they would have remained outside the hole? moreover look at the angle of the hole, very low to the ground, how does an airliner plunge from the air, travel some distance at very near zero altitude at terrific speed(if it peirced several rings of building) , without hitting other things like street lights, other buildings etc first? You would think an airline hijacked in the air would have a much steeper angle of descent and would have gone thru the roof not a side wall.
Also all that volatile airline fuel would surly make for huge explosion immediatly on impact? Could wreckage images of another crash been used?
Maybe it was a yank fighter jet, remember the italian cablecar fiasco?