Cockpit voice recorders only retain two hours of data at a time, sometimes frustrating investigators.
Mandatory Credit:	David Ryder/Bloomberg/Getty Images

Cockpit voice recorders only retain two hours of data at a time, sometimes frustrating investigators.
Mandatory Credit: David Ryder/Bloomberg/Getty Images

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Cockpit voice recorders only record 2 hours at a time. The NTSB chair wants it to be 25 hours

Investigators will never know exactly what the Alaska Airlines pilots were saying last week in the chaotic, loud first moments after a door plug blew off a Boeing 737 MAX 9, leaving a hole in the side of its fuselage shortly after takeoff.