UA 593 then DL 2709 at Houston
San Antonio → Houston → Atlanta
Timetable, Houston time
10:42UA 593 from San Antonio at the gate
08:05DL 2709 to Atlanta leaves the gate
21 h 23 apart on the timetable, overnight
DL 2709 leaves 21 h 23 after UA 593 arrives on the timetable: more than half a day, so not a connection we count.