For decades, business schools have taught Johnson & Johnson's handling of its 1982 Tylenol scandal as a textbook example of good crisis management. In the future, we can expect Boeing Co.'s treatment of its two 737 Max crashes to join the syllabus — as an example of what not to do.

Engineers at Boeing discovered problems with the aircraft's angle-of-attack sensors within months of the model's first delivery, but didn't share its findings with airlines, regulators or even senior management until much later, the company said Sunday.

That we're still getting incomplete details of the situation — almost two years after the problems were first found, and six months after the Lion Air crash last October that brought it to wider attention — is an almost perfect inversion of the Tylenol lesson.