AA 2230 then UA 1949 at Houston
Miami → Houston → Dallas-Fort Worth
Timetable, Houston time
23:58AA 2230 from Miami at the gate
20:20UA 1949 to Dallas-Fort Worth leaves the gate
20 h 22 apart on the timetable, overnight
UA 1949 leaves 20 h 22 after AA 2230 arrives on the timetable: more than half a day, so not a connection we count.