UA 3876 then UA 348 at Houston
IAB → Houston → Miami
Timetable, Houston time
03:25UA 3876 from IAB at the gate
16:20UA 348 to Miami leaves the gate
12 h 55 apart on the timetable
UA 348 leaves 12 h 55 after UA 3876 arrives on the timetable: more than half a day, so not a connection we count.