Reply #64: Yes, it does. There's nothing that points to "it's not aluminum".

[greyl]

There's no good reason to believe it isn't aluminum. Is there?

"this is right before the collapse, and it seems as though most of the plane aluminum would have been gone by then,"

What logic did you use to reach that conclusion? What reason to have to believe that all 150,000 pounds of aluminum on the aircraft would have melted away, out of our sight, in an hour?
Doesn't it make sense that molten aluminum would have pooling and flowing following gravity?
As the buildings were clad in aluminum, doesn't it make sense that molten aluminum eventually worked it's way out of the aluminum exterior at a point already damaged by the impact?