You really need to hurry on this one. I think you have 5 weeks to find one. Go to OAG.com, register, and start looking at ATL-(LAX/SFO/MCO/MIA/FLL). Better yet call Delta, get the number and address for the public realtions department and contact them. Tell them that you have never had the pleasure of flying on a Delta L-1011 and really would like to know how it could be arranged. I'm not saying that they'll provide something free, not by a long shot, but I bet they will let you know something. Lay it on thick, they eat it up (as all airlines do). Best of luck.
The day you stop learning is the day you should die.