UA 678 then DL 2709 at Houston
Mc Allen → Houston → Atlanta
Timetable, Houston time
08:24UA 678 from Mc Allen at the gate
08:05DL 2709 to Atlanta leaves the gate
23 h 41 apart on the timetable, overnight
DL 2709 leaves 23 h 41 after UA 678 arrives on the timetable: more than half a day, so not a connection we count.