Domestic 763s already have PTVs in both cabins as well as satellite TV and wi-fi. They're as modified as they're gonna get (unless you count their existence after eventual scrapping
).
In other news, as of today DAL88/89 (CDG-SLC/SLC-CDG) are now being flown again with 767-300ERs (with SLC crews
), back from the A330s used in the summer. It appears that it'll stay on the 767 until next summer. Today it was N1605.
-J.