DL 5678 then DL 1624 at Boston
Pittsburgh → Boston → Chicago O'Hare
Timetable, Boston time
13:55DL 5678 from Pittsburgh at the gate
13:35DL 1624 to Chicago O'Hare leaves the gate
23 h 40 apart on the timetable, overnight
DL 1624 leaves 23 h 40 after DL 5678 arrives on the timetable: more than half a day, so not a connection we count.