AA 3232 then UA 1066 at Houston
Phoenix → Houston → Denver
Timetable, Houston time
23:54AA 3232 from Phoenix at the gate
21:52UA 1066 to Denver leaves the gate
21 h 58 apart on the timetable, overnight
UA 1066 leaves 21 h 58 after AA 3232 arrives on the timetable: more than half a day, so not a connection we count.