AA 642 then DL 1622 at O'Hare
Dallas-Fort Worth → Chicago → Detroit
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
08:29DL 1622 to Detroit leaves the gate
19 h 19 apart on the timetable, overnight
DL 1622 leaves 19 h 19 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.