Delta AMEX currently have 2x points for every $ spent through end of September.
Good to know Delta miles are very valuable because they are easy to redeem for desirable awards
But Seriously can be a good deal , IMHO, for Flyers captive to Delta who want to lower butt in seat mile requirement for higher elite status.
I'm hard pressed as to why any flyertalker who is not ATL based would pick Delta Sky miles as their F.F. program of choice.