DL 2391 then DL 836 at Atlanta
Boston → Atlanta → Phoenix
Timetable, Atlanta time
16:35DL 2391 from Boston at the gate
16:25DL 836 to Phoenix leaves the gate
23 h 50 apart on the timetable, overnight
DL 836 leaves 23 h 50 after DL 2391 arrives on the timetable: more than half a day, so not a connection we count.