Ok - I've recreated the trip with ITA, and there is additional information, but I'm not sure what to do with it - call a travel agent? The last time there was a discrepancy between a similar fare on ITA and DL, the DL agent wouldn't construct the fare for me. (Sorry for the newby questions!)

Edit: I did some further digging and found the BookWithMatrix site. I was able to copy and paste the info from ITA into that site, but I could not get any of the booking options (Priceline, CheapOair or DL) to work. (DL gave me a pricing error, Cheap didn't do anything and Priceline froze while searching.) I also tried Hipmunk and it didn't work either.