AA 3073 then DL 508 at Boston
Philadelphia → Boston → Los Angeles
Timetable, Boston time
17:21AA 3073 from Philadelphia at the gate
16:15DL 508 to Los Angeles leaves the gate
22 h 54 apart on the timetable, overnight
DL 508 leaves 22 h 54 after AA 3073 arrives on the timetable: more than half a day, so not a connection we count.