This is particularly true in regard to design control over manned mission flight safety provisions.

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The head of a team responsible for flight safety during eruptions told the agency that an cloud of ashes over 100 kilometres in length was moving to the northeast and could pose a threat to aircraft on international routes near Kamchatka.

BBC: Volcano erupts in Russian Far East

"The air marshals and the flight attendants have legitimate concerns, certainly, for their own safety, but the threat of taking over a plane with a small, sharp instrument is zero, " Hawley said.

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The committee's report issued safety recommendations to the airline in order to ensure pilots were trained to follow correct procedure in handing over flight controls during critical moments and times.

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