AA 3276 then DL 5740 at Philadelphia
Los Angeles → Philadelphia → Boston
Timetable, Philadelphia time
06:05AA 3276 from Los Angeles at the gate
06:00DL 5740 to Boston leaves the gate
23 h 55 apart on the timetable, overnight
DL 5740 leaves 23 h 55 after AA 3276 arrives on the timetable: more than half a day, so not a connection we count.