AC 4121 then OZ 6303 at San Francisco
Ontario → San Francisco → Chicago O'Hare
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
17:10OZ 6303 to Chicago O'Hare leaves the gate
23 h 20 apart on the timetable, overnight
OZ 6303 leaves 23 h 20 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.