The question spurring fresh intrigue in the Air India crash
Mourners line streets at funeral of Air India pilot Sumit Sabharwal
A preliminary investigation into the Air India flight AI171 crash on 12 June revealed that the aircraft's fuel control switches were moved to the "cut-off" position, starving the engines.
Cockpit voice recordings captured a moment of confusion where one pilot questioned why the fuel had been cut off, which the other pilot denied.
The two pilots, Captain Sumeet Sabharwal and First Officer Cliver Kunder, had vastly different levels of experience, with Mr Sabharwal nearing retirement and Mr Kunder at the start of his career.
The Airline Pilots' Association of India has rejected the presumption of pilot error, calling for a "fair, fact-based inquiry," while Air India's CEO cautioned against premature conclusions.