UA 3873 then UA 1024 at Houston
Kansas City → Houston → Mexico City
Timetable, Houston time
10:47UA 3873 from Kansas City at the gate
07:35UA 1024 to Mexico City leaves the gate
20 h 48 apart on the timetable, overnight
UA 1024 leaves 20 h 48 after UA 3873 arrives on the timetable: more than half a day, so not a connection we count.