With conclusive information hard to come by weeks after the fatal Air India crash, the aviation industry has shifted its focus to possible pilot error.

An Air India Boeing (BA.N) 787 Dreamliner bound for London crashes shortly after takeoff from Ahmedabad city, killing all but one of the 242 people on board. India's Aircraft Accident Investigation Bureau (AAIB) launches an investigation into the world's deadliest crash in a decade.

Investigators have begun looking into the medical records of Captain Sumeet Sabharwal, the pilot who flew the Air India flight that crashed after takeoffSabharwal, 56, who has been an Air India employee since 1994,