AA 3232 then UA 6338 at Houston
Phoenix → Houston → Monterrey
Timetable, Houston time
23:54AA 3232 from Phoenix at the gate
18:42UA 6338 to Monterrey leaves the gate
18 h 48 apart on the timetable, overnight
UA 6338 leaves 18 h 48 after AA 3232 arrives on the timetable: more than half a day, so not a connection we count.