DL 751 then F9 3439 at Denver
New York LaGuardia → Denver → San Francisco
Timetable, Denver time
10:18DL 751 from New York LaGuardia at the gate
22:29F9 3439 to San Francisco leaves the gate
12 h 11 apart on the timetable
F9 3439 leaves 12 h 11 after DL 751 arrives on the timetable: more than half a day, so not a connection we count.