UA 3905 then AA 2520 at Houston
Cancún → Houston → Phoenix
Timetable, Houston time
13:29UA 3905 from Cancún at the gate
06:37AA 2520 to Phoenix leaves the gate
17 h 08 apart on the timetable, overnight
AA 2520 leaves 17 h 08 after UA 3905 arrives on the timetable: more than half a day, so not a connection we count.