AA 2230 then UA 5136 at Houston
Miami → Houston → Alexandria
Timetable, Houston time
23:58AA 2230 from Miami at the gate
18:55UA 5136 to Alexandria leaves the gate
18 h 57 apart on the timetable, overnight
UA 5136 leaves 18 h 57 after AA 2230 arrives on the timetable: more than half a day, so not a connection we count.