UA 1450 then DL 2709 at Houston
Washington National → Houston → Atlanta
Timetable, Houston time
08:31UA 1450 from Washington National at the gate
08:05DL 2709 to Atlanta leaves the gate
23 h 34 apart on the timetable, overnight
DL 2709 leaves 23 h 34 after UA 1450 arrives on the timetable: more than half a day, so not a connection we count.