Three years ago, Malaysia Airlines flight 370 disappeared over the South China Sea, starting an multinational hunt for the plane. Despite rumors of a sophisticated hijacking or seizure of the aircraft by a foreign government, it was presumed lost in the ocean. To prevent another disaster over open water, the UN pushed for particular plane signal system that can be tracked from the ground or by satellite. But Malaysia Airlines just struck a deal to use a network of the latter that will enable them to monitor their planes anywhere they fly on earth -- including over the polar ice caps.