DL 3869 then DL 1391 at Detroit
Elmira → Detroit → Philadelphia
Timetable, Detroit time
15:11DL 3869 from Elmira at the gate
14:55DL 1391 to Philadelphia leaves the gate
23 h 44 apart on the timetable, overnight
DL 1391 leaves 23 h 44 after DL 3869 arrives on the timetable: more than half a day, so not a connection we count.