No Mileage Plus upgrade.

飞行里数绩分提升。

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There are more than 100 Mileage Plus partners spanning the globe.

有超过100里程加上遍布全球的合作伙伴。

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For instance, United Mileage Plus fliers can redeem 2,000 miles for $100 worth of gift certificates at more than 15,000 restaurants.

例如，United Mileage Plus Fliers 可以用2000里来可以换取在150,00多家餐馆中任意一家的价值100美元的现金礼券。

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Interestingly, Mileage Plus analysis has shown that when members redeem miles for air-travel rewards, their loyalty increases.

FORBES: Built To Last: The Secret To Long-Term Customer Relationships

In full-disclosure, I am a frequent United flier (almost exclusively international and in premium cabins) and a top-tier Mileage Plus member and have been for quite a few years.

FORBES: United: This Is Not 'Any Way to Run an Airline'

During the first week of the Asian Tsunami in 2004, United Airlines' Mileage Plus members donated 40 million miles to help humanitarian organizations get support on the ground for the relief efforts.

CNN: Giving something back