UA 3905 then AA 3100 at Houston
Cancún → Houston → Miami
Timetable, Houston time
13:29UA 3905 from Cancún at the gate
09:49AA 3100 to Miami leaves the gate
20 h 20 apart on the timetable, overnight
AA 3100 leaves 20 h 20 after UA 3905 arrives on the timetable: more than half a day, so not a connection we count.