UA 1089 then DL 2709 at Houston
Mexico City → Houston → Atlanta
Timetable, Houston time
12:22UA 1089 from Mexico City at the gate
08:05DL 2709 to Atlanta leaves the gate
19 h 43 apart on the timetable, overnight
DL 2709 leaves 19 h 43 after UA 1089 arrives on the timetable: more than half a day, so not a connection we count.