UA 4701 then AA 1869 at Houston
Brownsville → Houston → Miami
Timetable, Houston time
13:28UA 4701 from Brownsville at the gate
13:20AA 1869 to Miami leaves the gate
23 h 52 apart on the timetable, overnight
AA 1869 leaves 23 h 52 after UA 4701 arrives on the timetable: more than half a day, so not a connection we count.