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They haven't changed much yet, but the Iridium Next constellation has hosted ADS-B payloads (as well as AIS). Sometime in 2018 these will be available globally,
by jccooper 9y ago
They haven't changed much yet, but the Iridium Next constellation has hosted ADS-B payloads (as well as AIS). Sometime in 2018 these will be available globally, and make it much harder for either ships or planes to be lost outside the range of land-based receivers.
That wouldn't help intentionally or accidentally disabled transceivers as was (probably) the case for MH370. That would require space based radar... which was once but is no longer a DoD project. It'll happen eventually.