AA 6486 then UA 2384 at O'Hare
Detroit → Chicago → San Diego
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
12:40UA 2384 to San Diego leaves the gate
19 h 11 apart on the timetable, overnight
UA 2384 leaves 19 h 11 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.