Structures Repair Question

[noisy]

Exhibit A

http://www.!!!!!!!!!!!!!!/open.file?i...to_nr=2&size=M

B747 D-ABYZ flying at Frankfurt in September. Nothing remarkable there.

Exhibit B

http://www.skyliner-aviation.de/photos/01dabyz.jpg

A picture of the same a/c which I remember seeing early on this year. (April / May?)

The question is; How badly damaged does an aircraft have to be before it is rendered permanently unairworthy? Exhibit B looks like a write off to my untrained eye.