I'd rather put my faith in carefully engineered, not randomly evolved solutions.
On the other hand, evolutionary approach would be introducing mostly pointless random changes in plane's schematics, building them all (even those doomed to failure), and making them carry passengers as soon as they're built. Then, after a few years, you'd take the schematics of those which did not crash, and repeat the process. _This_ is evolution, what you describe is rather closer to lamarckism.