If someone like yourself volunteers, they receive a free round trip ticket to be used within one year.

自愿的人可以得到一张一年内有效的免费往返票。

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Man purchasing round trip ticket to board the Statue of Liberty ferry in New York on May 1, 1968. (AP Photo)

1968年5月1日，一个男人购买了前往自由女神像的轮渡的往返船票。

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In the second half of May, a round trip ticket between Beijing and Frankfurt is less than four-thousand yuan. And the price for Beijing-Bangkok flights is only 15-hundred yuan.

在五月中下旬，‘北京-法兰克福’的往返机票不到4000元，而‘北京-曼谷’的机票也只要1500元。

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When Air Canada implemented its new pricing structure, it also eliminated many travel restrictions that passengers hated, such as requiring a Saturday-night stay and a round-trip ticket to get the lowest fare.

CNN: Pros and cons of a la carte airfare pricing

Delta says it, like other airlines, offers all seats on planes to frequent fliers, just at higher mileage cost than the lowest redemption level, which is 25, 000 miles for a domestic coach round-trip ticket.

WSJ: Frequent-Flier Miles: Best Airlines for Cashing In

In addition, Mr. Abdulmutallab's cash purchase of a round-trip ticket didn't trigger any secondary screening, calling into question the efficacy of the system that is supposed to spot passengers who are acting suspiciously and may be threats.

WSJ: The Middle Seat | How to Improve Travel in 2010