UA 3910 then DL 1682 at Houston
Washington → Houston → Atlanta
Timetable, Houston time
14:30UA 3910 from Washington at the gate
12:30DL 1682 to Atlanta leaves the gate
22 h apart on the timetable, overnight
DL 1682 leaves 22 h after UA 3910 arrives on the timetable: more than half a day, so not a connection we count.