UA 3913 then UA 4022 at Houston
Denver → Houston → Omaha
Timetable, Houston time
21:22UA 3913 from Denver at the gate
11:55UA 4022 to Omaha leaves the gate
14 h 33 apart on the timetable, overnight
UA 4022 leaves 14 h 33 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.