When Delta announced their merger with Northwest Airlines, they announced they would link the SkyMiles and World Perks accounts. I waited for them to send me the information on how to do this, and received it on May 13. It said that I could link my accounts and delay the expiration of my 47, 810 miles. When I went online to do this, I was informed that my miles had expired on April 30, and that had I linked the accounts sooner, they wouldn't have expired. I wrote to Delta and explained that they had waited until my miles expired to tell... read full review »