As others have said, but just to confirm, you are incorrect. Sometimes there have been D1 seats because DL is using an airplane with that cabin, but D1 is a service level that includes more than just the seats. It is the food and beverage, the number of flight attendants in the cabin, special check-in at LAX, full size blankets & pillows, etc. None of that has ever been offered on this route, or on any domestic route to ATL.