DL 2194 then DL 5138 at Detroit
Washington → Detroit → Knoxville
Timetable, Detroit time
07:40DL 2194 from Washington at the gate
19:49DL 5138 to Knoxville leaves the gate
12 h 09 apart on the timetable
DL 5138 leaves 12 h 09 after DL 2194 arrives on the timetable: more than half a day, so not a connection we count.