The London-bound plane struck a medical college hostel in a residential area of the northwestern city of Ahmedabad minutes after takeoff Thursday, killing 241 on board and at least 29 on the ground.
India's Aircraft Accident Investigation Bureau is investigating the crash with help from the U.S. National Transportation Safety Board. Authorities said Friday that the black box has been recovered.
Six flights from India declared emergencies within 30 minutes of each other. It comes as fake bomb threats are causing disruptions, diversions and delays for scores of flights on Indian airlines.
India's second-largest domestic carrier placed orders for 220 Boeing aircraft valued at $34 billion and 250 Airbus planes in a separate deal that could be worth tens of billions of dollars.
