Sigh...I'll try one last time. I know 5191 was not on a CDO. I never said they were. They had the sleep opportunity, but they didn't get the rest. CDO's set up a structure whereby you're guaranteed to not even have the opportunity and be operating during circadian lows. 5191 was caused in large part by fatigue. Fatigue that is guaranteed by CDO's. Why would we ever do that?

Carl