In addition, the airplane's combined flight data recorder and cockpit voice recorder were also sent to the NTSB for analysis.

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The cockpit voice recorder and the flight data recorder of the ill-fated plane are yet to be recovered, Ria Novosti reported at 02:15 local time on Thursday.

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On Sunday, the National Transportation Safety Board said the plane's cockpit voice recorder captured sounds of loud thumps seconds after the pilot and first officer commented on a nearby flock of birds.

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At a news conference Sunday, NTSB board member Kitty Higgins said the cockpit voice recorder captured sounds of loud "thumps" seconds after the pilot and first officer commented on a nearby flock of birds.

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The cockpit voice recorder was never recovered.

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