UA 4282 then UA 1919 at Houston
Jackson (Mississippi) → Houston → Cozumel
Timetable, Houston time
10:47UA 4282 from Jackson (Mississippi) at the gate
09:37UA 1919 to Cozumel leaves the gate
22 h 50 apart on the timetable, overnight
UA 1919 leaves 22 h 50 after UA 4282 arrives on the timetable: more than half a day, so not a connection we count.