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It was two years ago today that Malaysia Airlines Flight 370 vanished. There were 239 people on board, most of them Chinese. So what more do we know, two years on? And how has international plane travel changed in the interim? Mark Weiss is a retired American Airlines pilot who's flown Boeing 777s, and now runs an aviation firm. Just how much longer do investigators have - before the search is called off? PHOTO: MH370 relatives staged a small protest outside a temple in Beijing. Credit: EPA
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