AC 4121 then DL 8939 at San Francisco
Ontario → San Francisco → Phoenix
Timetable, San Francisco time
10:55AC 4121 from Ontario at the gate
23:00DL 8939 to Phoenix leaves the gate
12 h 05 apart on the timetable
DL 8939 leaves 12 h 05 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.