UA 4245 then AA 1869 at Houston
Jackson (Mississippi) → Houston → Miami
Timetable, Houston time
13:35UA 4245 from Jackson (Mississippi) at the gate
13:20AA 1869 to Miami leaves the gate
23 h 45 apart on the timetable, overnight
AA 1869 leaves 23 h 45 after UA 4245 arrives on the timetable: more than half a day, so not a connection we count.