DL 3176 then DL 726 at Atlanta
Mobile → Atlanta → Boston
Timetable, Atlanta time
14:24DL 3176 from Mobile at the gate
13:50DL 726 to Boston leaves the gate
23 h 26 apart on the timetable, overnight
DL 726 leaves 23 h 26 after DL 3176 arrives on the timetable: more than half a day, so not a connection we count.