<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by sosafan:
EFREM is correct about Delta Skymiles. There are also Delta FF miles which are listed separately on the skymiles statement,
and they don't (seem to) expire. (Some of my family has had them sitting around for 14 years.)</font>
Those Delta FF miles are from Delta's old FF program (pre-Skymiles). Delta grandfathered those miles under the old rules.