Investigators find black box in Northeast Philadelphia plane crash
Authorities are searching for answers as to why a Learjet 55 medical plane fell out of the sky in a violent crash Friday over Northeast Philly.
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What can the 'black box' tell us about plane crashes?
It's one of the most important pieces of forensic evidence following a plane crash: The so-called “black box." There are actually two of these remarkably sturdy devices: the cockpit voice ...