UA 4336 then DL 2709 at Houston
Harlingen → Houston → Atlanta
Timetable, Houston time
12:52UA 4336 from Harlingen at the gate
08:05DL 2709 to Atlanta leaves the gate
19 h 13 apart on the timetable, overnight
DL 2709 leaves 19 h 13 after UA 4336 arrives on the timetable: more than half a day, so not a connection we count.