DL 977 then OO 377 at San Francisco
Boston → San Francisco → Salt Lake City
Timetable, San Francisco time
11:25DL 977 from Boston at the gatealso KE 3255, WS 7983
10:38OO 377 to Salt Lake City leaves the gate
23 h 13 apart on the timetable, overnight
OO 377 leaves 23 h 13 after DL 977 arrives on the timetable: more than half a day, so not a connection we count.