UA 477 then DL 2709 at Houston
Memphis → Houston → Atlanta
Timetable, Houston time
08:28UA 477 from Memphis at the gate
08:05DL 2709 to Atlanta leaves the gate
23 h 37 apart on the timetable, overnight
DL 2709 leaves 23 h 37 after UA 477 arrives on the timetable: more than half a day, so not a connection we count.