UA 1782 then DL 2709 at Houston
New York LaGuardia → Houston → Atlanta
Timetable, Houston time
10:55UA 1782 from New York LaGuardia at the gate
08:05DL 2709 to Atlanta leaves the gate
21 h 10 apart on the timetable, overnight
DL 2709 leaves 21 h 10 after UA 1782 arrives on the timetable: more than half a day, so not a connection we count.