UA 4301 then UA 1028 at Houston
Lubbock → Houston → Mexico City
Timetable, Houston time
18:41UA 4301 from Lubbock at the gate
16:29UA 1028 to Mexico City leaves the gate
21 h 48 apart on the timetable, overnight
UA 1028 leaves 21 h 48 after UA 4301 arrives on the timetable: more than half a day, so not a connection we count.