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

Modern ones use computer chips inside hard casings. There are two recorders: a Cockpit Voice Recorder (CVR) for pilot voices or cockpit sounds, and a separate Flight Data Recorder (FDR).

All six people aboard the plane − a pilot and copilot, two medical personnel, a patient and her mother − died in the crash Friday.