Now, travelers have questions about whether or not it is safe to fly on Boeing's 787 Dreamliner plane. (According to aviation analytics firm Cirium, there are 1,148 Boeing 787s in service worldwide.)

The crash of an Air India Boeing 787 Dreamliner seconds after takeoff from Ahmedabad city, killing all but one of the 242 people on board, is the world's worst aviation disaster in a decade. At least 30 people were also killed on the ground as the airliner crashed into a medical college hostel near the airport.

Investigators believe the Boeing Dreamliner had its emergency-power generator operating during the Air India crash in Ahmedabad.