Through April 30, 2015 AAdvantage is celebrating the occasion of single loyalty program by offering up to 60,000 bonus miles when you buy AAdvantage miles. (takeoffwithmiles.com)
When that date becomes official, Marriott Rewards, The Ritz - Carlton Rewards and SPG members will be able to merge their accounts into a single loyalty program. (moneysense.ca)
There are enough differences between Hyatt and Starwood that integrating the two under a single loyalty program would be very complicated. (travelcodex.com)