UA 4226 then DL 2709 at Houston
Laredo → Houston → Atlanta
Timetable, Houston time
08:38UA 4226 from Laredo at the gate
08:05DL 2709 to Atlanta leaves the gate
23 h 27 apart on the timetable, overnight
DL 2709 leaves 23 h 27 after UA 4226 arrives on the timetable: more than half a day, so not a connection we count.