UA 4746 then DL 2709 at Houston
Nashville → Houston → Atlanta
Timetable, Houston time
11:02UA 4746 from Nashville at the gate
08:05DL 2709 to Atlanta leaves the gate
21 h 03 apart on the timetable, overnight
DL 2709 leaves 21 h 03 after UA 4746 arrives on the timetable: more than half a day, so not a connection we count.