DL 1091 then QF 4397 at San Francisco
Salt Lake City → San Francisco → Philadelphia
Timetable, San Francisco time
23:59DL 1091 from Salt Lake City at the gatealso VS 4542
22:58QF 4397 to Philadelphia leaves the gate
22 h 59 apart on the timetable, overnight
QF 4397 leaves 22 h 59 after DL 1091 arrives on the timetable: more than half a day, so not a connection we count.