New Delhi, Feb. 24 -- India's aviation regulator suspects a technical fault caused a false hijack alarm on an Air India flight last month, triggering an emergency response at two of the country's busiest airports, two senior officials have said. The Directorate General of Civil Aviation (DGCA) believes the incident was likely caused by a transponder malfunction on the Mumbai-bound flight from New Delhi, according to officials who spoke on condition of anonymity....