Students cannot apply for delayed tests if they try to get cheaper traffic tickets to go back to their own country earlier.

为购买便宜车票等原因而要求提前回国休假不能成为申请缓考的理由。

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The change will cover people who buy cheaper, nonrefundable tickets that the airline calls Wanna Get Away and Ding fares.

NPR: Higher Fares Help Southwest Airlines' Profit