UA 4271 then DL 2709 at Houston
Brownsville → Houston → Atlanta
Timetable, Houston time
10:37UA 4271 from Brownsville at the gate
08:05DL 2709 to Atlanta leaves the gate
21 h 28 apart on the timetable, overnight
DL 2709 leaves 21 h 28 after UA 4271 arrives on the timetable: more than half a day, so not a connection we count.