UA 2655 then DL 2709 at Houston
Washington → Houston → Atlanta
Timetable, Houston time
08:37UA 2655 from Washington at the gate
08:05DL 2709 to Atlanta leaves the gate
23 h 28 apart on the timetable, overnight
DL 2709 leaves 23 h 28 after UA 2655 arrives on the timetable: more than half a day, so not a connection we count.