AA 2230 then UA 331 at Houston
Miami → Houston → Washington National
Timetable, Houston time
23:58AA 2230 from Miami at the gate
16:55UA 331 to Washington National leaves the gate
16 h 57 apart on the timetable, overnight
UA 331 leaves 16 h 57 after AA 2230 arrives on the timetable: more than half a day, so not a connection we count.