Ive done that in the past but NOT using DL.One has to keep in mind not to do a NW & CO and place the miles into just 1 acct.

Or one can just buy the 2 tkts on 1 carrier but from 2 different places(1-online,2-from a reg travel agent). Since its illegeal according to the airlines to sell back to back,this will take care of that,only if theres a problem with miles missing its something that I wouldnt go after,if its on i carrier only