UA 1711 then AA 1869 at Houston
Las Vegas → Houston → Miami
Timetable, Houston time
15:15UA 1711 from Las Vegas at the gate
13:20AA 1869 to Miami leaves the gate
22 h 05 apart on the timetable, overnight
AA 1869 leaves 22 h 05 after UA 1711 arrives on the timetable: more than half a day, so not a connection we count.