The disappearance of Malaysia Airlines Flight 370 prompted a slew of safety proposals meant to prevent another jetliner from inexplicably vanishing. Yet four years later, that possibility remains. That's because international requirements for new planes to broadcast their locations every minute when they're in trouble don't take effect until January 2021. The disappearance of Flight 370 remains the biggest mystery in modern aviation, and the search to find it is the world’s longest hunt for any jet. Last month, a new crew resumedscouring the Indian Ocean. In an era where people can track their iPhones and Samsung Galaxy devices in real time, the world's most-advanced transportation industry still isn't obligated to do the same for craft carrying about 4 billion passengers a year. And that one-minute rule doesn’t apply to the current fleet of 23,500 passenger planes and the thousands more joining them in the next three years — mostly in Asia.
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