UA 3908 then UA 4013 at Houston
Orlando → Houston → Harlingen
Timetable, Houston time
08:45UA 3908 from Orlando at the gate
21:30UA 4013 to Harlingen leaves the gate
12 h 45 apart on the timetable
UA 4013 leaves 12 h 45 after UA 3908 arrives on the timetable: more than half a day, so not a connection we count.