美国联合航空公司（United Airlines）推出 2019 年第 1 次购买里程促销活动。通过 MileagePlus 官网购买里程，可享额外最高 85% 奖励。个别账户可能会定向到 100% 奖励。
美联航基本上每个月都有里程促销活动，最低价是 100% 奖励（买一送一）或者五折促销。85% 奖励也是 100% 奖励之外最便宜的了，有需要的也不妨下手。
促销网址：https://buymiles.mileageplus.com/united/united_landing_page/
促销时间：截止至 2019-3-1（约北京时间 2019-3-2 13:00）
官网简介：
Buy miles for your upcoming adventure and earn up to 85% bonus miles.
Buy 5,000 - 25,000 miles | Get 40% bonus
Buy 30,000 - 94,000 miles | Get 85% bonus
成本分析：
购买里程从 2,000 里起卖：
- 购买 5,000 - 25,000 里享额外 40% 奖励
- 购买 30,000 - 94,000 里享额外 85% 奖励
每个账号每年最多可以购买 175,000 里程。要注意的是，这个 17.5 万里程的购买限制是包括奖励的部分，也就是购买里程后实际到账的里数。
此次促销您可以最多购买：94,000 + 79,900（奖励） = 173,900 里，
价格是 $3,290 + $246.75（税费） = $3,536.75 美元，
成本：$3,536.75 美元 ÷ 173,900 里 × 10000 = $203.38 美元/万里 ≈ ￥1365.5 人民币/万里。
HotelDig 提醒您：
1．购买积分需使用信用卡支付，而且是立即扣款，不设退款。
2．通常完成购买后，积分立即到账，特殊情况不会超过 48 小时内到账。
3．购买的积分不能用于 MileagePlus 会员等级的保级或升级。
4．查看美联航里程票官方详细航班兑换标准请点这里。美联航的网上查票系统功能很强大和方便，自家的航班以及绝大多数星空联盟伙伴的机票都能在官网上使用积分兑换，查票入口请点这里。
5．美联航里程积分兑换机票有一点比较好的是，不管是兑换本航司还是星空联盟伙伴航空公司的机票，都不收取任何燃油附加税，通常只收取少量政府税费。
6．美联航积分销售是通过合作伙伴 Points.com 提供技术支持的，关于 Points.com 的介绍可以参考这篇文章：常旅客购买酒店积分或者航空里程的专门网站 Points.com 介绍。
促销条款：
- Promotional offer valid until 11:59 p.m. CT on March 1, 2019.
- Miles are available in increments of 1,000 up to a maximum of 94,000 miles.
- Bonuses will be calculated on a per transaction basis only. The bonus amount applicable to a transaction is shown in the chart. Transactions may not be aggregated to calculate the bonus.
- Bonus Miles will generally be credited to the recipient's MileagePlus account when the transaction is complete; provided that certain transactions may take up to 48 hours.
- Bonus miles count towards the 175,000 mile annual limit per account.
- Purchase up to 175,000 miles per account per calendar year.
- Credit card will be billed immediately upon purchase.
- Mileage rates and other fees and offer terms are subject to change.
- Pricing is only available for purchases made through buymiles.mileageplus.com
- Miles are nonrefundable.
- Purchased miles do not count toward MileagePlus Premier® status.
- All MileagePlus Program Rules and terms and conditions apply.
- GST/HST is charged to Canadian residents.
- Powered by Points to purchase United MileagePlus miles. Transaction will appear as 'Points United Miles'.
