UA 625 then DL 2709 at Houston
Phoenix → Houston → Atlanta
Timetable, Houston time
12:50UA 625 from Phoenix at the gate
08:05DL 2709 to Atlanta leaves the gate
19 h 15 apart on the timetable, overnight
DL 2709 leaves 19 h 15 after UA 625 arrives on the timetable: more than half a day, so not a connection we count.