AC 4121 then BA 6664 at San Francisco
Ontario → San Francisco → Chicago O'Hare
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
13:42BA 6664 to Chicago O'Hare leaves the gate
19 h 52 apart on the timetable, overnight
BA 6664 leaves 19 h 52 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.