Delta had a very few DC-10-10s, and not for very long; they got them in a merger with another airline (I think Western) and sold them off. (Delta used L-1011 Tristars as the backbone of their long-haul fleet from 1978-2001.)
They did have eight or ten MD-11s, they stopped flying them last year. A couple got sold or leased to World Airways (at least one's still flying with the red-and-blue Delta stripes under the World logo), the rest are, as far as I know, sitting out in the desert in California, unless UPS or another operator has picked some up for freighter use.
The MD-11 never really worked as a passenger liner for whatever reason, but it's sure found a second life as a freighter.
}:-)4
I had the pleasure of flying Atlanta to LAX (IIRC) on a Delta L-1011 just days before the craft was retired from the fleet.