There was a double-miles-on-everything Delta Amex promotion earlier this year, but it's over and everyone is waiting for the double miles to post...expected in early to mid-October.
You can get single miles now by purchasing at
www.savingsbonds.gov (not dot com).
Beginning the end of this year it will become impossible to purchase bonds with a credit card, so if you want miles you have to do it in the next few months.
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Middle_Seat