AA 5621 then DL 5845 at Philadelphia
Greenville-Spartanburg → Philadelphia → Boston
Timetable, Philadelphia time
09:50AA 5621 from Greenville-Spartanburg at the gate
09:00DL 5845 to Boston leaves the gate
23 h 10 apart on the timetable, overnight
DL 5845 leaves 23 h 10 after AA 5621 arrives on the timetable: more than half a day, so not a connection we count.