WASHINGTON — What began as an inquiry into a mysterious sound in the background of an airplane cockpit voice recording escalated into an unexpected challenge for the nation's top safety investigators.

WASHINGTON, Jan 30 (Reuters) - The U.S. Federal ‌Aviation Administration on Friday finalized a ‌rule to require cockpit voice recorders to retain 25 hours of data for all new passenger airplanes in ...

The National Transportation Safety Board temporarily pulled its docket system offline after digital images were used to reconstruct cockpit voice... The NTSB tries to keep cockpit audio recordings ...

Chris Babcock, an engineer at the National Transportation Safety Board, in one of the audition rooms at the agency's headquarters in Washington, D.C. (Joel Rose | NPR) WASHINGTON — What began as an ...