I'd argue the three frequent flyer programs which most frequently and lucratively sell miles are Alaska Mileage Plan,American AAdvantage, and Avianca LifeMiles. Of those, and the airline from which I most frequently buy miles is Alaska Mileage Plan,given the unique partnerships the airline has.
Alaska Mileage Plan is offering a mystery bonus on the purchase of miles, whereby you can earn between 35% and 50% bonus miles when you buy Alaska miles. This is a limited time promotion, or though there's no close date for it published.
My Mileage Plan account was targeted for a 40% bonus:The post considerable Deal: Up To 50% Bonus On Purchased Alaska Miles appeared first on One Mile at a Time.
Source: boardingarea.com