did you ever try to make a reservation with 1-800-221-1212 thedelta reservations line? the call may be free but your time is notand you will loose a lot of it.
I have been caught many times on that line.I use 1-800-325-1551, which is far more efficient and has...shock. horror....real people answering.The other thing you shoud consider is that by going through a travel agent, you can check a variety of fares across competing airlines. Better still, do it on the web.