UA 3905 then UA 5201 at Houston
Cancún → Houston → Shreveport
Timetable, Houston time
13:29UA 3905 from Cancún at the gate
09:00UA 5201 to Shreveport leaves the gate
19 h 31 apart on the timetable, overnight
UA 5201 leaves 19 h 31 after UA 3905 arrives on the timetable: more than half a day, so not a connection we count.