Investors and the wider public are looking for answers after Thursday’s crash of an Air India 787 jet. Both of the plane’s black boxes have been recovered.

Was the Boeing 787-8 Dreamliner that crashed over Ahmedabad seconds after taking off airworthy? When was it overhauled and maintained last time? Was there any issue with the engine? These questions are being asked the pilot sent the Mayday signals immediately after the plane could take off.

The Boeing 787-8 Dreamliner carrying 242 people bound for Britain's Gatwick Airport began losing altitude seconds after takeoff. All but one passenger died in the world's worst aviation disaster in a decade, with around 30 ground fatalities.