UA 5939 then DL 2709 at Houston
Omaha → Houston → Atlanta
Timetable, Houston time
11:05UA 5939 from Omaha at the gate
08:05DL 2709 to Atlanta leaves the gate
21 h apart on the timetable, overnight
DL 2709 leaves 21 h after UA 5939 arrives on the timetable: more than half a day, so not a connection we count.