AM 470 then UA 4573 at Houston
Mexico City → Houston → Huntsville
Timetable, Houston time
18:25AM 470 from Mexico City at the gate
18:10UA 4573 to Huntsville leaves the gate
23 h 45 apart on the timetable, overnight
UA 4573 leaves 23 h 45 after AM 470 arrives on the timetable: more than half a day, so not a connection we count.