KUALA LUMPUR, Malaysia — After 17 days of desperation and doubt over the missing Malaysia Airlines jet, the country's officials said an analysis of satellite data points to a "heartbreaking" conclusion: Flight 370 met its end in the southern reaches of the Indian Ocean, and none of those aboard survived. The somber announcement late Monday by Prime Minister Najib Razak left unresolved many more troubling questions about what went wrong aboard the Boeing 777 to take it so far off-course. It also unleashed a maelstrom of sorrow and anger among the families of the jet's 239 passengers and crew.