UA444 has been one of the LAX-SFO-BOS 'direct' redeye flights since the merger. the LAX-SFO tag using 444 is an on and off thing, but the TCON redeye is always 444.
UA352 is the late IAD-BOS flight.
EWR-HNL had been 50/51 for a while, but now that seems to change on a regular basis. ORD-HNL has been UA219 perhaps since the merger. at one point it was a 'direct' flight from BDL. people always questioned their hearing when the FA announcement in the early morning at BDL stated that this was UA219 "...with continuing service to honolulu."
i know this is trivial (but hey, this is FT after all), but if there is ever a grand renumbering, UA should try to match area codes to flights in the evening bank. it would be nice to leave a meeting in chicago and know that i'm boarding UA860 back home to BDL.