Modern jetliners just aren’t supposed to fall out of the sky. It’s simply not acceptable (it’s not acceptable when smaller aircraft do it, either, by the way). Decades of refinement, engineering, development and lessons learned have produced an extremely safe worldwide air transportation system. That’s one reason the disappearance of an Airbus A330 operating as Air France Flight 447 from over the Atlantic Ocean almost three years ago is serving as a wake-up call to operators and pilots alike.

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