UA 226 then DL 2709 at Houston
Boston → Houston → Atlanta
Timetable, Houston time
10:51UA 226 from Boston at the gate
08:05DL 2709 to Atlanta leaves the gate
21 h 14 apart on the timetable, overnight
DL 2709 leaves 21 h 14 after UA 226 arrives on the timetable: more than half a day, so not a connection we count.