AM 472 then UA 3917 at Houston
Mexico City → Houston → Austin
Timetable, Houston time
09:38AM 472 from Mexico City at the gate
07:30UA 3917 to Austin leaves the gate
21 h 52 apart on the timetable, overnight
UA 3917 leaves 21 h 52 after AM 472 arrives on the timetable: more than half a day, so not a connection we count.