AA 642 then AA 1138 at O'Hare
Dallas-Fort Worth → Chicago → Atlanta
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
12:56AA 1138 to Atlanta leaves the gate
23 h 46 apart on the timetable, overnight
AA 1138 leaves 23 h 46 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.