Through November 15, 2013, American is offering tiered bonuses on the purchase of AAdvantage miles. The bonus thresholds are as follows:
So the “sweet spot” here is probably purchasing 50,000 AAdvantage miles and getting 15,000 bonus AAdvantage miles, which is the equivalent of a 30% bonus. If you do that, 65,000 miles would cost you $1,513.13, which is ~2.3 cents per mile.
Certainly not a rate at which I’d speculatively purchase miles, but in some cases that can be a good value. I expect we’ll see a better promotion in the next few months, but it’s certainly better than nothing.
As always, it’s worth noting that points purchases with American are processed by points.com, meaning they wouldn’t qualify as airline spend for the purposes of your credit card.