UA 4300 then AA 1869 at Houston
Lubbock → Houston → Miami
Timetable, Houston time
13:41UA 4300 from Lubbock at the gate
13:20AA 1869 to Miami leaves the gate
23 h 39 apart on the timetable, overnight
AA 1869 leaves 23 h 39 after UA 4300 arrives on the timetable: more than half a day, so not a connection we count.