UA 6 then AA 1869 at Houston
Tokyo Narita → Houston → Miami
Timetable, Houston time
14:50UA 6 from Tokyo Narita at the gate
13:20AA 1869 to Miami leaves the gate
22 h 30 apart on the timetable, overnight
AA 1869 leaves 22 h 30 after UA 6 arrives on the timetable: more than half a day, so not a connection we count.