DL 1397 then DL 5258 at Atlanta
Austin → Atlanta → Knoxville
Timetable, Atlanta time
20:10DL 1397 from Austin at the gate
17:45DL 5258 to Knoxville leaves the gate
21 h 35 apart on the timetable, overnight
DL 5258 leaves 21 h 35 after DL 1397 arrives on the timetable: more than half a day, so not a connection we count.