Between now and January 31, 2012, when you buy the AAdvantage® miles you need to book your travel now, you’ll earn up to 15,000 bonus miles. Bonuses start at mileage purchases of just 2,000 miles! 2,000~6,000 miles: 500 bonus miles;6,000~12,000 miles: 2,000 bonus miles;12,000~40,000 miles: 4,000 bonus miles;40,000 miles: 15,000 bonus miles.从折扣力度来看，买满40,000miles的折扣(73折)高于之前年末时候的75折那次优惠，买6,000miles和12,000miles的和之前持平，其他里程选择都不太划算。