UA 1318 then DL 2709 at Houston
Phoenix → Houston → Atlanta
Timetable, Houston time
10:40UA 1318 from Phoenix at the gate
08:05DL 2709 to Atlanta leaves the gate
21 h 25 apart on the timetable, overnight
DL 2709 leaves 21 h 25 after UA 1318 arrives on the timetable: more than half a day, so not a connection we count.