I may have mentioned this in another thread. Way back, about 8 years or so, FedEx had a promo that will give you Delta miles whenever you used FedEx for shipping. At the time I was working with a company that used FX a lot. I entered the code in question on my employer profile with FedEx, and I received numerous DL miles from it. My employer had about 11 locations around the US, and the other locations where using the same profile as well. Even after I left, I still got DL miles as well.