UA 4909 then DL 2709 at Houston
Huntsville → Houston → Atlanta
Timetable, Houston time
13:23UA 4909 from Huntsville at the gate
08:05DL 2709 to Atlanta leaves the gate
18 h 42 apart on the timetable, overnight
DL 2709 leaves 18 h 42 after UA 4909 arrives on the timetable: more than half a day, so not a connection we count.