Articles by Siva Govindasamy and Tim Hepher; Additional reporting by Edgar Su, Andrea Shalal, Mark Hosenball, and Anshuman Daga

Planning Could Hold Key to Disappearance of Flight MH370

Whether by accident or design, whoever reached across the dimly lit cockpit of a Malaysia Airlines jet and clicked off a transponder to make Flight MH370 vanish from controllers' radars flew into a navigational and technical black hole.