I can't imagine that the aerospace business is that different from the software industry or the automotive industry in that every product that gets delivered ha

I can't imagine that the aerospace business is that different from the software industry or the automotive industry in that every product that gets delivered has known defects of unknown severity. It would surprise me if the planes didn't have at least a few hundred known issues -- a dozen of which may prove to be more serious than first anticipated. Engineering reality may not match romantic expectation. Even for something as important as aeroplanes.