Investigators in India are studying the black boxes of a Boeing 787 Dreamliner after recovering them from the aircraft wreckage to ascertain the cause of last week’s plane crash that left at least 270 people dead.

The crash of Air India flight AI171, a Boeing 787 Dreamliner, shortly after takeoff from Ahmedabad has shaken the global aviation community. With hundreds of lives lost, and intense scrutiny from investigators,

India’s oldest airline was facing challenges even before Thursday, when a Boeing jet it operated crashed shortly after takeoff on Thursday and killed more than 240 people on board. Air India hasn’t suffered crashes in its recent past, but it has been working to overcome a legacy of unprofitability and a reputation for shoddy service.