AA 642 then DL 1578 at O'Hare
Dallas-Fort Worth → Chicago → Minneapolis
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
09:59DL 1578 to Minneapolis leaves the gate
20 h 49 apart on the timetable, overnight
DL 1578 leaves 20 h 49 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.