A cockpit voice recording of doomed Air India Flight 171 indicates that it was the younger co-pilot who asked his more experienced colleague why he turned off the plane's fuel-supply switches, according to people familiar with the matter.

International airlines from South Korea and India are preparing to inspect its Boeing fleets following findings from the Air India crash investigation.

The deadly Air India crash last month has renewed a decades-old debate in the aviation industry over installing video cameras monitoring airline pilot actions to complement the cockpit voice and flight data recorders already used by accident investigators.

Experts says only few people were well-versed with the aviation industry to tell fake from genuine information, and debunk wildly speculative hypotheses.