A London-bound Air India Boeing 787 crashed into a hostel near Ahmedabad airport, killing 241 people. The mayday call came seconds after take-off. Investigators race to find answers behind this deadly plane crash as India mourns its deadliest aviation disaster in 40 years. NDTV's Ankit Tyagi, Abhishek Awasthi, Shiv Aroor and Vishnu Som join Parmeshwar Bawa with the key details of what we know and the haunting questions that remain.