DL 5604 then AA 866 at Boston
Memphis → Boston → Chicago O'Hare
Timetable, Boston time
13:35DL 5604 from Memphis at the gate
13:30AA 866 to Chicago O'Hare leaves the gate
23 h 55 apart on the timetable, overnight
AA 866 leaves 23 h 55 after DL 5604 arrives on the timetable: more than half a day, so not a connection we count.