777 domestic flying comes and goes on MIA-JFK, MIA-DFW and DFW-LAX.
MIA-LAX is the only consistent domestic 777 route, since around 2006. Some times it is 2x daily, that starts up again in March.
Huge uptick in domestic 763 flying nowadays, though. Four daily MIA-MCO starts soon and eight daily DFW-LAX by April.