AA 3974 then 7L 789 at O'Hare
Harrisburg → Chicago → Baku
Timetable, Chicago time
15:34AA 3974 from Harrisburg at the gate
10:007L 789 to Baku leaves the gate
18 h 26 apart on the timetable, overnight
7L 789 leaves 18 h 26 after AA 3974 arrives on the timetable: more than half a day, so not a connection we count.