A London-bound Air India Boeing 787 Dreamliner crashed into a residential neighbourhood in Meghani Nagar, just outside Ahmedabad’s Sardar Vallabhbhai Patel International Airport, on Thursday afternoon. The aircraft burst into flames shortly after takeoff, sending plumes of thick black smoke over the city, complicating rescue efforts. The visuals of the incident showed the aircraft crashing behind a cluster of buildings and erupting into a ball of fire. The AI-171, travelling to London's Gatwick airport, had issued a MAYDAY call moments before losing contact with air traffic control. Authorities are still assessing casualties and investigating the cause. Here are some of the key questions, answered