It's very clear that the airline industry has the most thorough incident investigation systems and arguably the least effective responses to the outcomes of those investigations.
The industry must take into account the concept of paying passenger perceptions. It can't continue the current cockpit security arrangements. This incident, as infrequent as it is historically, should not be regarded as a rare outlier.
It's clear that the post 9/11 security arrangements are not effective. The industry needs to acknowledge the current limitations of automatic control.
Despite all the noise this forum highlights a number of recurrent themes that managers should heed.