DL 3869 then DL 1787 at Detroit
Elmira → Detroit → Washington
Timetable, Detroit time
15:11DL 3869 from Elmira at the gate
14:57DL 1787 to Washington leaves the gate
23 h 46 apart on the timetable, overnight
DL 1787 leaves 23 h 46 after DL 3869 arrives on the timetable: more than half a day, so not a connection we count.