AA 2230 then UA 6132 at Houston
Miami → Houston → Lubbock
Timetable, Houston time
23:58AA 2230 from Miami at the gate
20:00UA 6132 to Lubbock leaves the gate
20 h 02 apart on the timetable, overnight
UA 6132 leaves 20 h 02 after AA 2230 arrives on the timetable: more than half a day, so not a connection we count.