AA 2166 then 7L 789 at O'Hare
Boston → Chicago → Baku
Timetable, Chicago time
12:29AA 2166 from Boston at the gate
10:007L 789 to Baku leaves the gate
21 h 31 apart on the timetable, overnight
7L 789 leaves 21 h 31 after AA 2166 arrives on the timetable: more than half a day, so not a connection we count.