Quoting B747forever (Reply 3): I am not sure, but I believe that the 75X will operate your ATL and MSP flights, which means that they will have PTVs.
With DL having so many 752 subfleets, having a 75X on a longer domestic flight is not guaranteed.
Quoting DL_Mech (Reply 4): The 753s also have wi-fi entertainment on demand available.
Supposedly it was supposed to work with tablets and mobile devices by early last year, but I couldn't get it to work on my flight in October. I'm glad I've got stuff loaded onto my tablet that I can watch or listen to.