Investigators confirmed they have recovered a cockpit voice recorder and a flight-data recorder from American Eagle Flight 5342, which will undergo analysis.

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 recorder and the flight data recorder.

Investigators found the recording devices, or black boxes, from the American Airlines plane and Black Hawk helicopter that crashed on Wednesday.