Here's what is known about the air crash so far: One of the strongest pieces of evidence that investigators are reviewing is a 59-second CCTV video clip that clearly shows the takeoff and the crash of the plane from Sardar Vallabhbhai Patel International Airport in Ahmedabad city, western Gujarat state.

Management installed by the Tata Group had spent three years struggling to undo a reputation for shoddy operations earned during decades of state ownership.

At least 270 bodies have been recovered after a London-bound Air India plane crashed into a medical college hostel in the western Indian city of Ahmedabad this week, a hospital official told reporters on Saturday.