DL 5703 then AA 2166 at Boston
Baltimore → Boston → Chicago O'Hare
Timetable, Boston time
10:41DL 5703 from Baltimore at the gate
10:20AA 2166 to Chicago O'Hare leaves the gate
23 h 39 apart on the timetable, overnight
AA 2166 leaves 23 h 39 after DL 5703 arrives on the timetable: more than half a day, so not a connection we count.