UA 556 then DL 2709 at Houston
Nashville → Houston → Atlanta
Timetable, Houston time
08:45UA 556 from Nashville at the gate
08:05DL 2709 to Atlanta leaves the gate
23 h 20 apart on the timetable, overnight
DL 2709 leaves 23 h 20 after UA 556 arrives on the timetable: more than half a day, so not a connection we count.