B6 2120 then AA 2146 at Boston
San Diego → Boston → Chicago O'Hare
Timetable, Boston time
06:20B6 2120 from San Diego at the gate
05:43AA 2146 to Chicago O'Hare leaves the gate
23 h 23 apart on the timetable, overnight
AA 2146 leaves 23 h 23 after B6 2120 arrives on the timetable: more than half a day, so not a connection we count.