UA 4271 then UA 1919 at Houston
Brownsville → Houston → Cozumel
Timetable, Houston time
10:37UA 4271 from Brownsville at the gate
09:37UA 1919 to Cozumel leaves the gate
23 h apart on the timetable, overnight
UA 1919 leaves 23 h after UA 4271 arrives on the timetable: more than half a day, so not a connection we count.