AC 4121 then AA 939 at San Francisco
Ontario → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
10:55AC 4121 from Ontario at the gate
23:23AA 939 to Dallas-Fort Worth leaves the gatealso CZ 1632
12 h 28 apart on the timetable
AA 939 leaves 12 h 28 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.