Originally Posted by
ubernostrum
So far as I know, US does not have regularly-scheduled widebody service. They just move some of the TATL birds onto popular domestic routes during the off-season, but not in any sort of way I've ever seen predicted (and those can get downgauged in a hurry if they need one of those planes due to MX with the ones flying international).
This^
Historically, the closest thing US has had to regularly scheduled domestic widebody service is probably PHL-SJU-PHL with nearly daily service using a spare A330. That route with a morning departure from PHL allows the plane to be back to PHL in case it's needed for a TATL flight.
This may well change in the future since US is getting more widebodies (A332) than adding announced TATL routes.
Jim