DL 2804 then 5X 609 at O'Hare
Boston → Chicago → Philadelphia
Timetable, Chicago time
22:36DL 2804 from Boston at the gate
22:005X 609 to Philadelphia leaves the gate
23 h 24 apart on the timetable, overnight
5X 609 leaves 23 h 24 after DL 2804 arrives on the timetable: more than half a day, so not a connection we count.