I used points.com to transfer miles from Alaska Airlines and America West to Delta miles. Since it was my first transfer, it was free. The transfer ratio was bad but I only needed 500 Delta miles anyway. Its a good program to use if you have miles sitting around that you cannot transfer or use normally (like under 1000 miles). It took a while for the miles to post to my Delta acct because Delta had just signed with points.com and was having difficulty setting up their program. The program does work and the points.com people will email you back.