LAX777 flew its last LAX-LHR about a week ago - it's now 787. I don't think that's going to work because there were a lot of F passengers on that route. I'm not sure those passengers are going to be happy with C on that flight. F, C and cargo were making that route profitable (plenty of open seats in Y). The 787 doesn't have F and hauls less cargo.

As for LAX777 lines for April, the only destinations are HNL, DEN, SFO, and ORD. And the DEN flights are to/from HNL. I was expecting to see some transcons (LAX-EWR, LAX-IAD).

So no, LAX777 isn't taking a bunch of domestic NB flying in April.