UA 5935 then UA 445 at Denver
Salt Lake City → Denver → Boston
Timetable, Denver time
20:03UA 5935 from Salt Lake City at the gate
17:56UA 445 to Boston leaves the gate
21 h 53 apart on the timetable, overnight
UA 445 leaves 21 h 53 after UA 5935 arrives on the timetable: more than half a day, so not a connection we count.