UA 4523 then DL 2709 at Houston
Huntsville → Houston → Atlanta
Timetable, Houston time
08:40UA 4523 from Huntsville 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 4523 arrives on the timetable: more than half a day, so not a connection we count.