DL 2869 then DL 5138 at Detroit
Washington National → Detroit → Knoxville
Timetable, Detroit time
07:45DL 2869 from Washington National at the gate
19:49DL 5138 to Knoxville leaves the gate
12 h 04 apart on the timetable
DL 5138 leaves 12 h 04 after DL 2869 arrives on the timetable: more than half a day, so not a connection we count.