An aviation expert believes the co-pilot on Air India flight AI171 pulled the plane's wing flaps instead of retracting the landing gear, causing the plane to crash.

Commercial airline pilot and YouTuber Captain Steve, who analyzes plane crashes and close calls, gave his theory on the incident which killed 241 people on board.

The London-bound 787 Dreamliner began losing height moments after take-off and crashed in a fireball over a residential area in the Ahmedabad, Gujarat.

Steve said he suspected there had been an exceptionally simple error in the cockpit when the co-pilot was asked to retract the landing gear, with devastating consequences.

He said: 'Here's what I think happened, again folks this is just my opinion. I think the pilot flying said to the co-pilot said 'gear up' at the appropriate time.