UA 4827 then DL 2709 at Houston
Amarillo → Houston → Atlanta
Timetable, Houston time
13:44UA 4827 from Amarillo at the gate
08:05DL 2709 to Atlanta leaves the gate
18 h 21 apart on the timetable, overnight
DL 2709 leaves 18 h 21 after UA 4827 arrives on the timetable: more than half a day, so not a connection we count.