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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I'm a frequent flier, and I get upgraded to first class on every flight.

我经常坐飞机，而且每次飞行我都可以坐头等舱。

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But when you're a frequent flier, you can have an excessive amount of stuff.

不过，如果你经常飞来飞去，就会有很多东西需要带。

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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