美联航 Mile Play：完成特定任务送里程
美联航（United）不断有 Mile Play 促销，就是根据每个人的飞行历史，给予不同的任务奖励。通常要求在特定的一段时间内，完成特定的飞行任务（比如预定一次机票等），然后可以得到几百到几万不等的...
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