DL 4654 then DL 1335 at Atlanta
Knoxville → Atlanta → Austin
Timetable, Atlanta time
09:44DL 4654 from Knoxville at the gate
21:55DL 1335 to Austin leaves the gate
12 h 11 apart on the timetable
DL 1335 leaves 12 h 11 after DL 4654 arrives on the timetable: more than half a day, so not a connection we count.