United is giving MileagePlus members a good deal on purchasing miles via a three-day promotion. Frequent fliers can receive a 30% and 60% MileagePlus bonus on miles purchased between Sept. 3-5, depending how many people purchase them -- if more than 1,500 people complete purchases, they will receive the 60%. Buyers are encouraged to share via social media to increase their changes of obtaining the 60% bonus. "This is a great chance for MileagePlus members to maximize their bonus opportunities by spreading the word to family and friends," said Praveen Sharma, United's vice president of loyalty and business development.

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