Even with mileage sales, it's still not a great idea to spend money just for miles. (upgradedpoints.com)
Frequent flyer mileage sales makes up the remaining $ 2.9 billion. (petergreenberg.com)
Remember that American Airlines processes its own mileage sales which means that, if you use a credit card that offers a bonus for airline purchases, that bonus will kick in. (travelingformiles.com)