UA 3873 then M6 5771 at Houston
Kansas City → Houston → Louisville
Timetable, Houston time
10:47UA 3873 from Kansas City at the gate
07:00M6 5771 to Louisville leaves the gate
20 h 13 apart on the timetable, overnight
M6 5771 leaves 20 h 13 after UA 3873 arrives on the timetable: more than half a day, so not a connection we count.