UA 582 then OO 377 at San Francisco
Boston → San Francisco → Salt Lake City
Timetable, San Francisco time
11:54UA 582 from Boston at the gatealso CA 7223
11:11OO 377 to Salt Lake City leaves the gate
23 h 17 apart on the timetable, overnight
OO 377 leaves 23 h 17 after UA 582 arrives on the timetable: more than half a day, so not a connection we count.