I see it from 12/22 to 1/2 in both directions. Not sure if it reappears later. Don’t know if there is a non-tedious way to check since the PDF timetable currently posted only runs through 12/15...
For non-767 equipment you can use an aircraft code to search a month at a time in ITA Matrix -- see the thread wiki under "
one way to search for these on ITA"