With a complement of 280 passengers and 15 crew, MH17 made its way over Germany, Poland and Ukraine, reaching its cruising altitude of 33,000 feet and flying straight and level, but at 1:21 p.

载有280名乘客和15名机组人员的MH17客机，正沿着航线经过德国、波兰和乌克兰，到达巡航高度33，000英尺的高空，直线平行飞行，但是在下午1时21分，雷达已经与航班失联。

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But the ISS partners have to make contingencies, and if Soyuz rockets are out of service for a while, the station will see its crew complement reduced - perhaps all the way to zero.

BBC: November deadline for ISS crews

The International Space Station will gain its full crew complement of six next month, when NASA astronaut Don Pettit, European Space Agency astronaut Andre Kuipers, and cosmonaut Oleg Kononenko launch from Kazakhstan on December 21.

FORBES: Space Station Astronauts Land Safely In Kazakhstan

So why didn't the regulators, shipbuilders or operators make the obvious connection between lifeboat capacity and the total complement of passengers and crew?

WSJ: The Real Reason for the Tragedy of the Titanic