AA 2230 then UA 4552 at Houston
Miami → Houston → Little Rock
Timetable, Houston time
23:58AA 2230 from Miami at the gate
18:10UA 4552 to Little Rock leaves the gate
18 h 12 apart on the timetable, overnight
UA 4552 leaves 18 h 12 after AA 2230 arrives on the timetable: more than half a day, so not a connection we count.