Air India and Boeing are in the midst of significant turnarounds, but knowing the cause of the crash of Flight 171 will take a lengthy investigation.

The Air India plane that crashed in Ahmedabad on June 12 was a Boeing 787 Dreamliner aircraft. As per a report, Air India had 34 Boeing 787 airframes in its fleet before the crash.

Boeing has pulled out of this week’s Paris airshow, which is traditionally an important event for aircraft manufacturers to announce big orders, saying it would instead focus on the investigation.

It could take months to fully understand what went wrong in the crash, the first involving a Dreamliner. Officials from India continued the investigation Friday.

An Air India crash Thursday involved a Boeing 787-8 Dreamliner, which the aircraft manufacturer first delivered 14 years ago.

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A helicopter crashed in the northern Indian state of Uttarakhand on Sunday, killing seven people on board. Local officials said the aircraft was flying from the town of Kedarnath to Guptkashi, which is a prominent Hindu pilgrimage site in the Himalayas.

A woman who died along with her grandson and her daughter-in-law in a plane crash in India has been described as "the mother of Wellingborough". At least 270 people were killed on Thursday when a Boeing 787 bound for Gatwick crashed shortly after take off in Ahmedabad.