Imagine someday paying for a beer with frequent flier miles.

设想一下，有一天你能够用飞行里程积分换杯啤酒喝。

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The good news is, you've earned enough frequent flier miles for a free ticket to Afghanistan.

好消息是你们已经累积了足够的飞行里数得到一张免费机票去阿富汗。

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I used to think frequent flier miles were only awarded to, you know, frequent fliers. Or people who use an American Express for big company expenses.

我过去一直认为常规的乘客里程只会奖励给那些常客，或者是那些使用美国运通旅行支票的乘客以及为大公司花费的人。

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Best for having your frequent flier account balances within easy reach for spontaneous upgrades.

BBC: Five best air travel apps

There are 61 million members of frequent flier programs in the U.S, according to airlines.

CNN: How can you earn frequent flier miles?

And the increased price of jet fuel only adds to the incentive to shut out frequent flier members.

FORBES: Delta, U.S. Airways Rank Worst for Frequent Flier Options