How did both engines shut down seconds after take-off? The key theories explained - Here are the four main theories investigators are now exploring

The investigation report says Air India did not carry out those inspections - prompting speculation that the accident could have been caused by faulty switches being flipped by accident. However, in an internal note seen by the BBC, the FAA has since reiterated its belief that the issue did not compromise safety.

The erosion of trust has triggered apprehensions among the public about air travel. I know of many erstwhile frequent fliers, who thought nothing before taking a flight for work or leisure, now hesitating before making the next flight booking.

An aviation expert believes the Air India plane disaster which killed more than 200 people was the result of “suicide by the captain” after new information came to light.

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 aviation expert believes it is possible to rule out one potential cause of the Air India crash, which killed around 270 people. The plane had just taken off from Ahmedabad airport in India and was destined for London Gatwick when it crashed into a built-up area on June 12.

Although the preliminary report into what caused the loss of Air India Flight 171 last month has provided some answers, it has also prompted a wave of speculation about its cause. The BBC's International Business Correspondent Theo Leggett reports on what we know - and what we don't know - so far.