As a reminder, currently both US Airways and American Airlines are running similar buy miles promotions, where you can buy either US Airways Divdened Miles or American Airlines AAdvantage miles for as little as 1.88 cent (plus taxes and fees) per mile through January 2, 2015.Both American Airlines and US Airways are offering the same Buy Miles offer.With this offer, you’ll earn either up to 45,000 AAdvantage bonus miles, or up to 45,000 US Airways Dividend Miles when you buy miles for yourself, or when you gift miles to a friend or family member. Below is the chart, which is the same for both offers, on how many bonus miles you will receive:American Airlines Buy Miles offer.If you were to max out this promotion and buy 80,000 miles, you would be receiving 45,000 bonus miles for a total for 125,000 miles for $2360 which comes down to only 1.88 cents per mile. Per my recent valuations of miles and points, I value US Airways miles at 1.9 cents, and American AAdvantage miles at 1.7 cents, so depending on your redemptions, this could be a great way to boost your balances in both programs.Earn a bonus of up to 100% on purchased US Airways miles. (Image courtesy of Shutterstock)Currently, you can not transfer miles between the two programs, so if you were to buy US Airways miles you wouldn’t be able to transfer to American, and if you were to buy AAdvantage miles, you wouldn’t be able to transfer to your US Airways account. Later on in 2015, you will be able to transfer your US Airways miles to American, but not the other way around.My ThoughtsCheck out my post on the Top 11 Awards To Book With US Airways Miles Now That It Is A Member of Oneworld to see some great uses for Dividend Miles. US Airways is currently in the process of merging with American Airlines; flyers on both airlines can already earn and redeem miles reciprocally, and the Dividend Miles and AAdvantage programs will eventually merge as well.Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.Do you plan on taking advantage of either of these offers, and what redemptions do you have in mind?[card card-name=‘Citi® / AAdvantage® Platinum Select® MasterCard®’ card-id=‘22144516’ type=‘javascript’ bullet-id=‘1’]