UA 3236 then UA 1028 at Houston
Midland → Houston → Mexico City
Timetable, Houston time
18:30UA 3236 from Midland at the gate
16:29UA 1028 to Mexico City leaves the gate
21 h 59 apart on the timetable, overnight
UA 1028 leaves 21 h 59 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.