UA 3920 then DL 2709 at Houston
Orlando → Houston → Atlanta
Timetable, Houston time
19:47UA 3920 from Orlando at the gate
08:05DL 2709 to Atlanta leaves the gate
12 h 18 apart on the timetable, overnight
DL 2709 leaves 12 h 18 after UA 3920 arrives on the timetable: more than half a day, so not a connection we count.