Iran plane crash: What are black boxes, and why are they so important?

Iranian officials said on Friday that it will analyze the black box recordings of the Ukrainian plane — which was carrying 63 Canadians and more who lived in Canada — that downed outside Tehran earlier this week.

However, officials from several countries, including Canada and Ukraine, have demanded to have access to all matters related to the investigation. On Thursday, Prime Minister Justin Trudeau said the plane was likely shot down by an Iranian missile, and that he wants answers.

“Canada is working with its allies to ensure that a thorough and credible investigation is conducted to determine the causes of this fatal crash. As I said yesterday, Canadians have questions and they deserve answers,” Trudeau said.

Iran, which denies the Boeing 737-800 was downed by a missile, said it could take one or two months to extract information from the voice and flight data recorders.

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