AA 642 then UA 1293 at O'Hare
Dallas-Fort Worth → Chicago → Santa Ana
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
08:53UA 1293 to Santa Ana leaves the gate
19 h 43 apart on the timetable, overnight
UA 1293 leaves 19 h 43 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.