Originally Posted by Racnad

The History channel documentary mentioned that the wing struck a truck parked nearby before the plane hit the building. The large photo you posted shows a large truck engulfed in flames. If the impact with the truck pulverized the last several feet of the wing (the truck looks heavy but a plane wing is light, although it contains fuel which would have drenched the truck on impact), that would explain why the damage to the building to the right of the hole doesn't extend as far as one might expect.