AA 3232 then UA 429 at Houston
Phoenix → Houston → Mexico City
Timetable, Houston time
23:54AA 3232 from Phoenix at the gate
21:45UA 429 to Mexico City leaves the gate
21 h 51 apart on the timetable, overnight
UA 429 leaves 21 h 51 after AA 3232 arrives on the timetable: more than half a day, so not a connection we count.