[Mamzelle]

From the pictures provided here, it looks as if the plane came in level to do maximum damage to one floor. It is also square in the middle of the floor...

Terrorist? Nut? But it sure looks like it was on purpose. An accident would be at an angle, and wouldn't have hit center.

[Travis McGee]

That building was centerpunched on the floor which would be most likely to result in a 9-11 type structural collapse.

360* in a circle times 90* level to vertical is a LOT of sky.

Possible engine trouble (pure speculation) has nothing to do with steering a plane.

Anyone who thinks this is a coincidental accident is in denial or is a moron.