UA 6259 then DL 2709 at Houston
Knoxville → Houston → Atlanta
Timetable, Houston time
08:40UA 6259 from Knoxville at the gate
08:05DL 2709 to Atlanta leaves the gate
23 h 25 apart on the timetable, overnight
DL 2709 leaves 23 h 25 after UA 6259 arrives on the timetable: more than half a day, so not a connection we count.