UA 3905 then UA 5049 at Houston
Cancún → Houston → Hattiesburg
Timetable, Houston time
13:29UA 3905 from Cancún at the gate
08:05UA 5049 to Hattiesburg leaves the gate
18 h 36 apart on the timetable, overnight
UA 5049 leaves 18 h 36 after UA 3905 arrives on the timetable: more than half a day, so not a connection we count.