UA 2760 then DL 2709 at Houston
San Diego → Houston → Atlanta
Timetable, Houston time
13:22UA 2760 from San Diego at the gate
08:05DL 2709 to Atlanta leaves the gate
18 h 43 apart on the timetable, overnight
DL 2709 leaves 18 h 43 after UA 2760 arrives on the timetable: more than half a day, so not a connection we count.