AA 818 then 7L 789 at O'Hare
Charlotte → Chicago → Baku
Timetable, Chicago time
12:22AA 818 from Charlotte at the gate
10:007L 789 to Baku leaves the gate
21 h 38 apart on the timetable, overnight
7L 789 leaves 21 h 38 after AA 818 arrives on the timetable: more than half a day, so not a connection we count.