B6 2120 then AA 690 at Boston
San Diego → Boston → Philadelphia
Timetable, Boston time
06:20B6 2120 from San Diego at the gate
06:00AA 690 to Philadelphia leaves the gate
23 h 40 apart on the timetable, overnight
AA 690 leaves 23 h 40 after B6 2120 arrives on the timetable: more than half a day, so not a connection we count.