I recently redeemed 37,500 AAdvantage miles for an award with AA. I have both the legacy US Airways Barclays card as well as a Citi AAdvantage card. I figured only one card would apply the 10% redemption rebate on the award, so I was surprised when I browsed to my recent account activity and saw two separate transactions noting a 10% rebate!
Unfortunately, upon closer inspection, I realized that the bonus had been split between the two cards…1,875 on each for a total of 3,750 miles or the full 10% rebate.
If you haven’t yet merged your accounts, this may be a reason to keep them separate. You’ll be able to maximize the 10,000 AAdvantage miles per calendar year redemption limit on each account.