AA 4518 then 7L 789 at O'Hare
Memphis → Chicago → Baku
Timetable, Chicago time
12:40AA 4518 from Memphis at the gate
10:007L 789 to Baku leaves the gate
21 h 20 apart on the timetable, overnight
7L 789 leaves 21 h 20 after AA 4518 arrives on the timetable: more than half a day, so not a connection we count.