DL 2804 then UA 5539 at O'Hare
Boston → Chicago → Moline
Timetable, Chicago time
22:36DL 2804 from Boston at the gate
21:47UA 5539 to Moline leaves the gate
23 h 11 apart on the timetable, overnight
UA 5539 leaves 23 h 11 after DL 2804 arrives on the timetable: more than half a day, so not a connection we count.