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.

A preliminary report on the investigation into the Air India flight that crashed last month has answered some questions about the fatal accident but raised many more and fuelled speculation about the cause.

The United States National Transportation Safety Board Chair Jennifer Homendy said on Friday that recent media reports on the crash of an Air India Boeing Dreamliner that killed 260 people were premature and speculative.