Originally Posted by
rmadisonwi
When the remaining ex-UA 752s retire, I'd be surprised if they are replaced by a domestic narrowbody with lie-flats. Either they will use more of the HD 777s, or. If they do get new narrowbodies, they will probably be something like the A321LR for use similar to the ex-CO 752s (short TATL, plus EWR-west coast transcons).
Maybe towards the end of the 752 retirement they will use the 763 as a replacement. DL seems to have no problem using 76W on the transcon run.