[color=cc9900]Hell, it's not even a proper metal frame. Jetliner wings are not dissimilar to doped-fabric wings, but with metals instead of wood and stretched fabric. They're designed for strength transverse to the direction of travel, so they can cope with the stresses of lift along their length. Not for longitudinal stress - they crumple, and rightfully so. I've flown gliders, which even with a doped fabric and wood construction probably have stronger wings in relation to their size, and if you want to kill yourself the best way to do that is to touch a wingtip on the ground during take-off. If it sticks, blam, you're stuck in the middle of a frickin' huge two-pronged cartwheel. Now imagine a jetliner doing that - because of the different shape, you'll end up with one end (probably the cockpit) smashing into the ground at high speed with the rest not far behind. That is
not a Good Thing™, especially with a lot of fuel in the wings. So they're
designed not to be uber-strong, and hence why you can see some (leading section where the wings join the hull, I expect) wing damage on the pictures but absolutely nothing else.
And, for a little happy from-memory quoting:[/color]
In the continuing battle between man in machines flying hundreds of miles an hour, and the ground at zero miles per hour, the ground has yet to lose.