AA 642 then 7L 789 at O'Hare
Dallas-Fort Worth → Chicago → Baku
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
10:007L 789 to Baku leaves the gate
20 h 50 apart on the timetable, overnight
7L 789 leaves 20 h 50 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.