DL 3858 then DL 5138 at Detroit
Elmira → Detroit → Knoxville
Timetable, Detroit time
07:35DL 3858 from Elmira at the gate
19:49DL 5138 to Knoxville leaves the gate
12 h 14 apart on the timetable
DL 5138 leaves 12 h 14 after DL 3858 arrives on the timetable: more than half a day, so not a connection we count.