F9 4409 then DL 1601 at Atlanta
Washington → Atlanta → Houston
Timetable, Atlanta time
23:13F9 4409 from Washington at the gate
22:41DL 1601 to Houston leaves the gate
23 h 28 apart on the timetable, overnight
DL 1601 leaves 23 h 28 after F9 4409 arrives on the timetable: more than half a day, so not a connection we count.